High resolution systems, kits, apparatus, and methods using lateral flow for high throughput microbiology applications

ABSTRACT

A method for providing a lateral flow of liquid across a plurality of microwells of a microfabricated device. The microwells of the microfabricated device are covered by a membrane which includes a first portion disposed on one side of at least one microwell and a second portion on the other side of the at least one microwell. The first portion of the membrane is contacted with a liquid absorbable by the membrane such that the liquid is wicked by the membrane and laterally flows from the first portion to the second portion and across the at least one microwell. At least a portion of the liquid enters the at least one microwell.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. Nonprovisional patent application Ser. No. 15/135,377, filed on Apr. 21, 2016, which claims the benefit of U.S. Provisional Patent Application No. 62/299,088 filed Feb. 24, 2016, U.S. Provisional Patent Application No. 62/292,091 filed Feb. 5, 2016, and U.S. Provisional Patent Application No. 62/150,677 filed Apr. 21, 2015. This application also claims the benefit of U.S. Provisional Patent Application No. 62/357,138, filed on Jun. 30, 2016. The disclosure of each of these prior-filed applications is incorporated by reference herein in its entirety.

TECHNICAL FIELD

The present disclosure relates generally to innovations in microbiology, microfabrication, chemistry, optics, robotics, and information technology. More specifically, the present disclosure relates to systems, apparatus, kits, and methods for high throughput cultivation, screening, isolation, sampling, and/or identification of biological entities and/or nutrients.

BACKGROUND

Traditional techniques and tools for cultivating biological entities from environmental and other samples are often slow, laborious, and expensive. Even with these techniques and tools, often cells and other biological entities still defy all attempts at culture, resulting in missed information and/or product opportunities. Likewise, the screening of a population of biological entities for a particular metabolite, enzyme, protein, nucleic acid, phenotype, mutation, metabolic pathway, gene, adaptation, capability, and/or therapeutic benefit is challenging, requiring complex and expensive methods. For example, microbes live in extremely high-risk environments. To survive, microbes have developed amazing sets of biochemical tools, including novel enzymes, unique metabolites, innovative genetic pathways, and strategies for manipulating their environment and their microbial neighbors—powerful solutions that could lead to new insights and products ranging from life-saving antibiotics to fertilizers that improve food production and security.

SUMMARY

The present disclosure provides microbiology systems, apparatus, kits, and methods for streamlining the cultivation workflow, supporting high throughput screening, and/or developing new insights and products in accordance with some embodiments. For example, an apparatus may comprise a microfabricated device for receiving a sample comprising one or more cells. The microfabricated device defines a high density array of microwells for cultivating one or more cells.

In some embodiments of the present disclosure, a method is provided. A microfabricated device having a plurality of microwells is provided, and a membrane applied on the microfabricated device and covering at least one microwell of the plurality of the microwells, the membrane having a first portion disposed on one side of the at least one microwell and a second portion on the other side of the at least one microwell. The first portion of the membrane is contacted with a first liquid absorbable by the membrane such that the first liquid is wicked by the membrane and laterally flows from the first portion to the second portion and across the at least one microwell, and at least a portion of the liquid enters into the at least one microwell.

In some embodiments, the first liquid comprises at least one reagent, and the at least one reagent enters into the at least one microwell. In some embodiments, the at least one microwell comprises a substance reactive to the at least one reagent in the first liquid. The reaction between the substance and the at least one reagent can produce a visually observable change.

In some embodiments, the at least one microwell comprises at least one substance, and when the first liquid laterally flows across the at least one microwell, at least a portion of the at least one substance is drawn out of the at least one microwell.

The second portion of the membrane can be exposed to air. The membrane can include a third portion disposed between the first portion and the second portion, the third portion being covered by a liquid impermeable barrier.

In some embodiments, the method further includes contacting the first portion of the membrane with a second liquid such that the second liquid is wicked by the membrane and laterally flows from the first portion to the second portion across the at least one microwell. Before contacting the first portion of the membrane with the second liquid, the first portion of the membrane can be contacted with a third liquid to flush out a portion of the first liquid remaining in the at least one microwell.

In some embodiments, the at least one microwell includes at least one biological entity that does not migrate out of the at least one microwell. In some embodiments, the at least one microwell comprise a chemical entity tethered in the microwell such that the chemical entity does not migrate out of the at least one microwell.

In some embodiments, the first liquid comprises a media. In some embodiments, the first liquid comprises an antibody. The antibody can be conjugated to a fluorescent label. In some embodiments, the first liquid comprises a fluorescent or colorimetric reagent.

In some embodiments, the present disclosure provides a method which includes: providing a microfabricated device having a plurality of microwells; loading a sample into at least one microwell of the plurality of microwells; applying a membrane on the microfabricated device to cover the at least one microwell, a first portion of the membrane being disposed on one side of the at least one microwell and a second portion of the membrane being disposed on the other side of the at least one microwell; and contacting the first portion of the membrane with a first liquid absorbable by the membrane such that the first liquid is wicked by the membrane and laterally flows from the first portion to the second portion and across the at least one microwell, and at least a portion of the first liquid enters into the at least one microwell.

In any of the methods described herein, the plurality of microwells of the microfabricated device can have a surface density of at least 150 microwells per cm², at least 250 microwells per cm², at least 400 microwells per cm², at least 500 microwells per cm², at least 750 microwells per cm², at least 1,000 microwells per cm², at least 2,500 microwells per cm², at least 5,000 microwells per cm², at least 7,500 microwells per cm², at least 10,000 microwells per cm², at least 50,000 microwells per cm², at least 100,000 microwells per cm², or at least 160,000 per cm². In any of the methods described herein, each microwell of the plurality of microwells of the microfabricated device can have a diameter of from about 5 μm to about 500 μm, from about 10 μm to about 300 μm, or from about 20 μm to about 200 μm.

It should be appreciated that all combinations of the foregoing concepts and additional concepts discussed in greater detail below (provided such concepts are not mutually inconsistent) are contemplated as being part of the inventive subject matter disclosed herein. In particular, all combinations of claimed subject matter appearing at the end of this disclosure are contemplated as being part of the inventive subject matter disclosed herein. It should also be appreciated that terminology explicitly employed herein that also may appear in any disclosure incorporated by reference should be accorded a meaning most consistent with the particular concepts disclosed herein.

Other systems, processes, and features will become apparent to those skilled in the art upon examination of the following drawings and detailed description. It is intended that all such additional systems, processes, and features be included within this description, be within the scope of the present invention, and be protected by the accompanying claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The skilled artisan will understand that the drawings primarily are for illustrative purposes and are not intended to limit the scope of the inventive subject matter described herein. The drawings are not necessarily to scale; in some instances, various aspects of the inventive subject matter disclosed herein may be shown exaggerated or enlarged in the drawings to facilitate an understanding of different features. In the drawings, like reference characters generally refer to like features (e.g., functionally similar and/or structurally similar elements).

FIG. 1 is a perspective view illustrating a microfabricated device or chip in accordance with some embodiments.

FIGS. 2A-2C are top, side, and end views, respectively, illustrating dimensions of microfabricated device or chip in accordance with some embodiments.

FIGS. 3A and 3B are exploded and top views, respectively, illustrating a microfabricated device or chip in accordance with some embodiments.

FIGS. 4A and 4B are diagrams illustrating a membrane in accordance with some embodiments; FIG. 4C is an image of a membrane surface with impressions formed from contact with an array of wells in accordance with some embodiments.

FIG. 5A is a flowchart illustrating a method for isolating cells from a sample in accordance with some embodiments. FIG. 5B is a diagram illustrating a method for isolating cells from a soil sample in accordance with some embodiments.

FIG. 6 is a flowchart illustrating a method for isolating and cultivating cells from a sample in accordance with some embodiments.

FIG. 7 is a diagram illustrating a method for isolating and cultivating cells from a complex sample in accordance with some embodiments.

FIGS. 8A-8C are diagrams illustrating picking by one pin or multiple pins in accordance with some embodiments.

FIGS. 9A-9D are images demonstrating picking of a well in accordance with some embodiments.

FIGS. 10A-10D are diagrams illustrating a tool for picking a chip in accordance with some embodiments.

FIG. 11 is an image of a well that has been picked through a thin layer of agar, illustrating picking through a membrane or sealing layer in accordance with some embodiments.

FIG. 12 is a diagram illustrating a cross-section of a chip 1200 in accordance with some embodiments.

FIG. 13 is a flowchart illustrating methods for screening in accordance with some embodiments.

FIG. 14 is a diagram illustrating a screening method in accordance with some embodiments.

FIG. 15 is a series of images illustrating a screening example in accordance with some embodiments.

FIGS. 16A-16C are images illustrating recovery from a screen in accordance with some embodiments.

FIG. 17A is an exploded diagram illustrating a chip for screening in accordance with some embodiments. FIG. 17B is a fluorescence image of a chip following screening in accordance with some embodiments. FIG. 17C is an image showing a process of picking a sample from the chip following screening in accordance with some embodiments.

FIG. 18 is a flowchart illustrating a counting method in accordance with some embodiments.

FIG. 19 is a diagram illustrating a counting method in accordance with some embodiments.

FIG. 20 is a diagram illustrating an indexing system in accordance with some embodiments.

FIGS. 21A-21E are diagrams illustrating a chip with well-specific chemistries in accordance with some embodiments.

FIG. 22A is a diagram illustrating lateral flow over a microfabricated device in accordance with some embodiments. FIG. 22B is top view illustrating this setup in accordance with some embodiments.

FIGS. 23A-23C are images illustrating a dye flowing across a microfabricated device in accordance with some embodiments.

FIGS. 24A-24E are images illustrating separate bands of dyes flowing across a microfabricated device and flushing of the dyes in accordance with some embodiments.

DETAILED DESCRIPTION

The present disclosure relates generally to systems, kits, apparatus, and methods for isolation, culturing, adaptation, sampling, and/or screening of biological entities and/or nutrients. A microfabricated device (or a “chip”) is disclosed for receiving a sample comprising at least one biological entity (e.g., at least one cell). The term “biological entity” may include, but is not limited to, an organism, a cell, a cell component, a cell product, and a virus, and the term “species” may be used to describe a unit of classification, including, but not limited to, an operational taxonomic unit (OTU), a genotype, a phylotype, a phenotype, an ecotype, a history, a behavior or interaction, a product, a variant, and an evolutionarily significant unit.

A cell may be Archaea, Bacteria, or Eukaryota (e.g., fungi). For example, a cell may be a microorganism, such as an aerobic, anaerobic, or facultative aerobic microorganisms. A virus may be a bacteriophage. Other cell components/products may include, but are not limited to, proteins, amino acids, enzymes, saccharides, adenosine triphosphate (ATP), lipids, nucleic acids (e.g., DNA and RNA), nucleosides, nucleotides, cell membranes/walls, flagella, fimbriae, organelles, metabolites, vitamins, hormones, neurotransmitters, and antibodies.

A nutrient may be defined (e.g., a chemically defined or synthetic medium) or undefined (e.g., a basal or complex medium). A nutrient may include or be a component of a laboratory-formulated and/or a commercially manufactured medium (e.g., a mix of two or more chemicals). A nutrient may include or be a component of a liquid nutrient medium (i.e., a nutrient broth), such as a marine broth, a lysogeny broth (e.g., Luria broth), etc. A nutrient may include or be a component of a liquid medium mixed with agar to form a solid medium and/or a commercially available manufactured agar plate, such as blood agar.

A nutrient may include or be a component of selective media. For example, selective media may be used for the growth of only certain biological entities or only biological entities with certain properties (e.g., antibiotic resistance or synthesis of a certain metabolite). A nutrient may include or be a component of differential media to distinguish one type of biological entity from another type of biological entity or other types of biological entities by using biochemical characteristics in the presence of specific indicator (e.g., neutral red, phenol red, eosin y, or methylene blue).

A nutrient may include or be a component of an extract of or media derived from a natural environment. For example, a nutrient may be derived from an environment natural to a particular type of biological entity, a different environment, or a plurality of environments. The environment may include, but is not limited to, one or more of a biological tissue (e.g., connective, muscle, nervous, epithelial, plant epidermis, vascular, ground, etc.), a biological fluid or other biological product (e.g., amniotic fluid, bile, blood, cerebrospinal fluid, cerumen, exudate, fecal matter, gastric fluid, interstitial fluid, intracellular fluid, lymphatic fluid, milk, mucus, rumen content, saliva, sebum, semen, sweat, urine, vaginal secretion, vomit, etc.), a microbial suspension, air (including, e.g., different gas contents), supercritical carbon dioxide, soil (including, e.g., minerals, organic matter, gases, liquids, organisms, etc.), sediment (e.g., agricultural, marine, etc.), living organic matter (e.g., plants, insects, other small organisms and microorganisms), dead organic matter, forage (e.g., grasses, legumes, silage, crop residue, etc.), a mineral, oil or oil products (e.g., animal, vegetable, petrochemical), water (e.g., naturally-sourced freshwater, drinking water, seawater, etc.), and/or sewage (e.g., sanitary, commercial, industrial, and/or agricultural wastewater and surface runoff).

A microfabricated device may define a high density array of microwells for cultivating the at least one biological entity. The term “high density” may refer to a capability of a system or method to distribute a number of experiments within a constant area. For example, a microfabricated device comprising a “high density” of experimental units may include about 150 microwells per cm² to about 160,000 microwells or more per cm², as discussed further herein. Additional examples are shown in TABLE 1.

TABLE 1 Spacing Length of side between Density of of microwells microwells microwells (μm) (μm) (wells/cm2) 500 500 100 100 100 2500 100 50 4489 100 10 8281 50 50 10000 50 10 27556 20 10 110889 10 5 444889 5 5 1000000

A microfabricated device may include a substrate with a series of functional layers. The series of functional layers may include a first functional layer defining a first array of experimental units (e.g., wells) and at least one subsequent functional layer defining a subsequent array of experimental units (e.g., microwells) in each experimental unit of the preceding functional layer. Each of the experimental units may be configured to receive and cultivate and/or screen biological entities and/or nutrients. In particular, systems, kits, apparatus, and methods described herein may be used for automated and/or high throughput screening of different conditions against a high density matrix of cells. For example, systems, kits, apparatus, and methods described herein may be used to test and compare the effect(s) of one or more different nutrients on the growth of microorganisms and/or screen for metabolites, enzyme activity, mutations, or other cell features.

FIG. 1 is a perspective view illustrating a microfabricated device or chip in accordance with some embodiments. Chip 100 includes a substrate shaped in a microscope slide format with injection-molded features on top surface 102. The features include four separate microwell arrays (or microarrays) 104 as well as ejector marks 106. The microwells in each microarray are arranged in a grid pattern with well-free margins around the edges of chip 100 and between microarrays 104.

FIGS. 2A-2C are top, side, and end views, respectively, illustrating dimensions of chip 100 in accordance with some embodiments. In FIG. 2A, the top of chip 100 is approximately 25.5 mm by 75.5 mm. In FIG. 2B, the end of chip 100 is approximately 25.5 mm by 0.8 mm. In FIG. 2C, the side of chip 100 is approximately 75.5 mm by 0.8 mm.

After a sample is loaded on a microfabricated device, a membrane may be applied to at least a portion of a microfabricated device. FIG. 3A is an exploded diagram of the microfabricated device 300 shown from a top view in FIG. 3B in accordance with some embodiments. Device 300 includes a chip with an array of wells 302 holding, for example, soil microbes. A membrane 304 is placed on top of the array of wells 302. A gasket 306 is placed on top of the membrane 304. A polycarbonate cover 308 with fill holes 310 is placed on top of the gasket 306. Finally, sealing tape 312 is applied to the cover 308.

A membrane may cover at least a portion of a microfabricated device including one or more experimental units, wells, or microwells. For example, after a sample is loaded on a microfabricated device, at least one membrane may be applied to at least one microwell of a high density array of microwells. A plurality of membranes may be applied to a plurality of portions of a microfabricated device. For example, separate membranes may be applied to separate subsections of a high density array of microwells.

A membrane may be connected, attached, partially attached, affixed, sealed, and/or partially sealed to a microfabricated device to retain at least one biological entity in the at least one microwell of the high density array of microwells. For example, a membrane may be reversibly affixed to a microfabricated device using lamination. A membrane may be punctured, peeled back, detached, partially detached, removed, and/or partially removed to access at least one biological entity in the at least one microwell of the high density array of microwells.

A portion of the population of cells in at least one experimental unit, well, or microwell may attach to a membrane (via, e.g., adsorption). If so, the population of cells in at least one experimental unit, well, or microwell may be sampled by peeling back the membrane such that the portion of the population of cells in the at least one experimental unit, well, or microwell remains attached to the membrane.

FIGS. 4A and 4B are diagrams illustrating a membrane in accordance with some embodiments. FIG. 4A shows a side view of a chip 400 defining an array of wells filled with content and a membrane 402 sealed on chip 400 over the array of wells, such that the surface of membrane 402 that was in contact with chip 400, when peeled off chip 400, has impressions of each of the wells with samples of the well contents attached (e.g., stuck) thereto, as shown in FIG. 4B. FIG. 4C is an image of a membrane surface with impressions formed from contact with an array of wells in accordance with some embodiments.

A membrane may be impermeable, semi-permeable, selectively permeable, differentially permeable, and/or partially permeable to allow diffusion of at least one nutrient into the at least one microwell of a high density array of microwells. For example, a membrane may include a natural material and/or a synthetic material. A membrane may include a hydrogel layer and/or filter paper. In some embodiments, a membrane is selected with a pore size small enough to retain at least some or all of the cells in a microwell. For mammalian cells, the pore size may be a few microns and still retain the cells. However, in some embodiments, the pore size may be less than or equal to about 0.2 μm, such as 0.1 μm. Membrane diameters and pore sizes depend on the material. For example, a hydrophilic polycarbonate membrane may be utilized, for which the diameter may range from about 10 mm to about 3000 mm, and the pore size may range from about 0.01 μm to about 30.0 μm. An impermeable membrane has a pore size approaching zero. In embodiments with an impermeable membrane, any nutrients must be provided in a microwell prior to being sealed with the membrane. A membrane that is gas permeable but not liquid permeable may allow oxygen into a microwell and carbon dioxide out of the microwell. The membrane may have a complex structure that may or may not have defined pore sizes. However, the pores may be on a nanometer scale. Other factors in selecting a membrane may include cost, ability to seal, and/or ability to sterilize.

A substrate may define an array of microchannels extended from a first surface to a second surface opposite the first surface. A microchannel may have a first opening in the first surface and a second opening in the second surface. A first membrane may be applied to at least a portion of the first surface such that at least some of the population of cells in at least one microchannel attach to the first membrane. A second detachable membrane may be applied to at least a portion of the second surface such that at least some of the population of cells in at least one microchannel attach to the second membrane. The population of cells in the at least one microchannel is sampled by peeling back the first membrane such that the at least some of the population of cells in the at least one microchannel remain attached to the first membrane and/or the second membrane such that the at least some of the population of cells in the at least one microchannel remain attached to the second membrane.

The term “high throughput” may refer to a capability of a system or method to enable quick performance of a very large number of experiments in parallel or in series. An example of a “high throughput” system may include automation equipment with cell biology techniques to prepare, incubate, and/or conduct a large number of chemical, genetic, pharmacological, optical, and/or imaging analyses to screen one or more biological entities for at least one of a metabolite, an enzyme, a protein, a nucleic acid, a phenotype, a mutation, a metabolic pathway, a gene, an adaptation, and a capability, as discussed herein. According to some embodiments, “high throughput” may refer to simultaneous or near simultaneous experiments on a scale ranging from at least about 96 experiments to at least about 10,000,000 experiments.

Systems, kits, apparatus, and methods disclosed herein may be used for high throughput screening of different conditions against a matrix of biological entities (e.g., cells). A “wells-within-wells” concept may be implemented by manufacturing (e.g., microfabricating) a substrate or chip to have multiple levels of functional layers to whatever level is required or desired (i.e., wells within wells within wells within wells, etc.). A first functional layer may define an array of experimental units (e.g., wells). Each of the experimental units presents a second functional layer by defining a subsequent array of experimental units (e.g., microwells). This enables multiple experiments or tests to be performed at the same time on a single chip, thus enabling high throughput operation.

For example, in FIGS. 3A and 3B, gasket 306 is placed on top of membrane 304, which is applied to an array of wells 302 on a microfabricated device 300 in accordance with some embodiments. Gasket 306 has only one opening. However, in further embodiments, multiple smaller gaskets with a smaller opening or a single gasket with more than one smaller opening may be placed on top of a device (either with or without a membrane), thereby forming a functional layer or an array of larger experimental units with a subsequent functional layer or subsequent array of experimental units (e.g., wells 302) located therein.

With multiple levels of functional layers, more than one nutrient or nutrient formulation, for example, can be tested simultaneously or near simultaneously. The same format may be used, for example, to screen for metabolites or specific capabilities of cells or to wean microorganisms from environmentally derived nutrients to other nutrients.

Experimental units are predetermined sites on a surface of a microfabricated device. For example, a surface of a chip may be designed to immobilize cells in a first array of predetermined sites. These predetermined sites may be wells, microwells, microchannels, and/or designated immobilization sites. For example, a surface may be manufactured to define an array of microwells. The array may be divided into sections by defining walls in the substrate or adding walls. For example, the surface may be manufactured to first define a first array of wells, in which an inner surface of each well, in turn, is manufactured to define a second array of microwells, microchannels, or immobilization sites. In another example, the surface may be manufactured to define an array of microwells, and another substrate (e.g., agar, plastic, or another material) is applied to the surface to partition the surface and the microwells defined thereby. Each well, microwell, microchannel, and/or immobilization site may be configured to receive and grow at least one cell; however, in use, any given well, microwell, microchannel, or immobilization site may or may not actually receive and/or grow one or more cells. Types of experimental units may be interchangeable. For example, embodiments herein that expressly describe microwells are also intended to disclose embodiments in which the microwells are at least in part replaced with microchannels, immobilization sites, and/or other types of experimental units.

One or more portions of a microfabricated device may be selected, treated, and/or coated with a surface chemistry modifier to have a particular surface chemistry. For example, at least a portion of a substrate surface may be configured with first surface characteristics that repel cells and/or reduce cellular tendency to stick to the surface or second surface characteristics that attract cells and/or increase cellular tendency to attach to the surface. Depending on the type of target cell, the material and/or coating may be hydrophobic and/or hydrophilic. At least a portion of the top surface of the substrate may be treated to have first surface characteristics that repel target cells and/or reduce the tendency of target cells to stick to the surface. Meanwhile, at least a portion of the inner surface of each experimental unit, well, or microwell may be treated to have second surface characteristics that attract target cells and increase the tendency of target cells to occupy the experimental unit, well, or microwell. A surface of a substrate may have a plurality of portions with different surface characteristics.

A surface chemistry modifier may be applied using chemical vapor deposition, electroporation, plasma treatment, and/or electrochemical deposition. The surface chemistry modifier may control surface potential, Lund potential, zeta potential, surface morphology, hydrophobicity, and/or hydrophilicity. The surface chemistry modifier may include a silane, a polyelectrolyte, a metal, a polymer, an antibody, and/or a plasma. For example, the surface chemistry modifier may include octadecyltrichlorosilane. The surface chemistry modifier may include a dynamic copolymer, such as polyoxyethylene (20) sorbitan monolaurate and/or polyethylene glycol p-(1,1,3,3-tetramethylbutyl)-phenyl ether. The surface chemistry modifier may include a static copolymer, such as poloxamer 407, poly(L-lysine), and/or a poly(ethylene glycol)-poly(l-lysine) block copolymer.

An apparatus for screening different conditions against a matrix of cells may include a substrate with a surface defining an array of microwells. Sections of the microwell array may be partitioned into subarrays (e.g., by larger wells or walls). The substrate may be microfabricated. Each microwell may receive and grow at least one biological entity (e.g., cell). The resulting matrix of biological entities (e.g., cells) may be a high density matrix of biological entities. The first array and/or the second array may be planar, substantially planar, and/or multi-planar (e.g., on a roll).

The term “high resolution” may refer to a capability of a system or method to distinguish between a number of available experiments. For example, a “high resolution” system or method may select an experimental unit from a microfabricated device comprising a high density of experimental units, in which the experimental unit has a diameter from about 1 nm to about 800 μm. A substrate of a microfabricated device or chip may include about or more than 10,000,000 microwells. For example, an array of microwells may include at least 96 locations, at least 1,000 locations, at least 5,000 locations, at least 10,000 locations, at least 50,000 locations, at least 100,000 locations, at least 500,000 locations, at least 1,000,000 locations, at least 5,000,000 locations, or at least 10,000,000 locations.

The surface density of microwells may be from about 150 microwells per cm² to about 160,000 microwells per cm² or more. A substrate of a microfabricated device or chip may have a surface density of microwells of at least 150 microwells per cm², at least 250 microwells per cm², at least 400 microwells per cm², at least 500 microwells per cm², at least 750 microwells per cm², at least 1,000 microwells per cm², at least 2,500 microwells per cm², at least 5,000 microwells per cm², at least 7,500 microwells per cm², at least 10,000 microwells per cm², at least 50,000 microwells per cm², at least 100,000 microwells per cm², or at least 160,000 microwells per cm².

The dimensions of a microwell may range from nanoscopic (e.g., a diameter from about 1 to about 100 nanometers) to microscopic or larger. For example, each microwell may have a diameter of about 1 μm to about 800 μm, a diameter of about 25 μm to about 500 μm, or a diameter of about 30 μm to about 100 μm. A microwell may have a diameter of about or less than 1 μm, about or less than 5 μm, about or less than 10 μm, about or less than 25 μm, about or less than 50 μm, about or less than 100 μm, about or less than 200 μm, about or less than 300 μm, about or less than 400 μm, about or less than 500 μm, about or less than 600 μm, about or less than 700 μm, or about or less than 800 μm.

A microwell may have a depth of about 500 μm to about 5000 μm, a depth of about 1 μm to about 500 μm, or a depth of about 25 μm to about 100 μm. A microwell may have a depth of about 1 μm, about 5 μm, about 10 μm, about 25 μm, about 50 μm, about 100 μm, about 200 μm, about 300 μm, about 400 μm, about 500 μm, about 600 μm, about 700 μm, about 800 μm, about 1000 μm, about 1,500 μm, about 2,000 μm, about 3,000 μm, or about 5,000 μm.

Each microwell may have an opening or cross section having any shape, e.g., round, hexagonal, or square. Each microwell may include sidewalls. For microwells that are not round in their openings or cross sections, the diameter of the microwells described herein refer to the effective diameter of a circular shape having an equivalent area. For example, for a square shaped microwell having side lengths of 10×10 microns, a circle having an equivalent area (100 square microns) has a diameter of 11.3 microns. The sidewalls may have a cross-sectional profile that is straight, oblique, and/or curved. At least one unique location-specific tag, as described further below, may be disposed in at least one microwell of the high density array of microwells to facilitate identification of a species and a correlation of a species to a specific microwell of the high density array of microwells. The at least one unique tag may be disposed and/or positioned at the bottom of the microwell and/or on at least one side of the microwell. The at least one unique tag may include a nucleic acid molecule with a target-specific nucleotide sequence for annealing to a target nucleic acid fragment of the at least one biological entity and a location-specific nucleotide sequence for identifying the at least one microwell of the high density array of microwells.

For example, a substrate of a microfabricated device or chip may have a surface with dimensions of about 4 inches by 4 inches. The surface may define an array of approximately 100 million microwells. The microwell array may be partitioned into about 100 subsections by walls and/or the substrate may define an array of about 100 wells, with about one million microwells defined within each subsection or well totaling to approximately 100 million microwells. For a use case of testing different nutrients, microorganisms from an environmental sample may be loaded on the chip such that individual microorganisms or clusters of microorganisms partition into the microwells on the chip, each microwell being located at the bottom of a larger well. Each larger well may include an experimental unit such that about 100 different nutrients may be tested in parallel or in series on the same chip, with each well providing up to 1 million test cases.

Target cells may be Archaea, Bacteria, or Eukaryota (e.g., fungi, plants, or animals). For example, target cells may be microorganisms, such as aerobic, anaerobic, and/or facultative aerobic microorganisms. Different nutrients may be tested in parallel or in series on a composition of target cells to analyze and compare, for instance, growth or other effects on cell population, cell components, and/or cell products. A composition of target cells may be screened for a cell component, product, and/or capability, such as one or more of a virus (e.g., a bacteriophage), a cell surface (e.g., a cell membrane or wall), a metabolite, a vitamin, a hormone, a neurotransmitter, an antibody, an amino acid, an enzyme, a protein, a saccharide, ATP, a lipid, a nucleoside, a nucleotide, a nucleic acid (e.g., DNA or RNA), a phenotype, a mutation, a metabolic pathway, a gene, and an adaptation.

A composition of cells may include an environmental sample extract and/or a dilutant. The environmental sample extract and/or the dilutant may include, but is not limited to, one or more of a biological tissue (e.g., connective, muscle, nervous, epithelial, plant epidermis, vascular, ground, etc.), a biological fluid or other biological product (e.g., amniotic fluid, bile, blood, cerebrospinal fluid, cerumen, exudate, fecal matter, gastric fluid, interstitial fluid, intracellular fluid, lymphatic fluid, milk, mucus, rumen content, saliva, sebum, semen, sweat, urine, vaginal secretion, vomit, etc.), a microbial suspension, air (including, e.g., different gas contents), supercritical carbon dioxide, soil (including, e.g., minerals, organic matter, gases, liquids, organisms, etc.), sediment (e.g., agricultural, marine, etc.), living organic matter (e.g., plants, insects, other small organisms and microorganisms), dead organic matter, forage (e.g., grasses, legumes, silage, crop residue, etc.), a mineral, oil or oil products (e.g., animal, vegetable, petrochemical), alcohol, a buffer, an organic solvent, water (e.g., naturally-sourced freshwater, drinking water, seawater, etc.), and/or sewage (e.g., sanitary, commercial, industrial, and/or agricultural wastewater and surface runoff).

A method may include, prior to applying (e.g., loading) a composition including cells to a microfabricated device, preparing the composition by combining the cells with an environmental sample extract and/or a dilutant. The method further may include liquefying the environmental sample extract and/or the dilutant. A concentration of cells in a composition may be adjusted to target distribution of one cell per experimental unit, well, or microwell.

If a sample contains cells and/or viruses, the cells in the sample may be lysed after they are applied to a microfabricated device to release nucleic acid molecules. Cells may be lysed with chemical treatment such as alkaline exposure, detergents, sonication, enzymatic proteinase K, or lysozyme exposure. Cells may also be lysed by heating.

FIG. 5A is a flowchart illustrating a method for isolating cells from a sample in accordance with some embodiments. In step 500, a sample is obtained. In step 502, the sample is homogenized and/or dispersed using at least one of a physical technique (e.g., blending and/or sonication) and a chemical technique (e.g., chelating agents, detergents, and/or enzymes). In step 504, cells in the homogenized and/or dispersed sample are separated by density centrifugation using, for example, Nycodenz® non-particulate medium (available from Progen Biotechnik GmbH, Heidelberg, Germany).

FIG. 5B is a diagram illustrating a method for isolating cells from a soil sample in accordance with some embodiments. Panel 506 shows the soil sample. Panel 508 shows the homogenized and/or dispersed sample in a test tube. Panel 510 shows the sample after centrifugation, separated into soluble debris 512, cells 514, insoluble debris 516, and Nycodenz® 518.

FIG. 6 is a flowchart illustrating a method for isolating and cultivating cells from a sample in accordance with some embodiments. In step 600, a sample is obtained. In step 602, at least one cell is extracted from the obtained sample. In step 604, at least one high density microwell array of a microfabricated device or chip is loaded with the at least one extracted cell. Step 604 may include preparing a cell concentration with the at least one extracted cell, selecting at least one nutrient/media, and/or selecting at least one membrane. In step 606, at least a portion of the microwell array is sealed with the at least one selected membrane to retain the cell concentration with the microwells. In step 608, the chip is incubated. Step 608 may include selecting a temperature, determining atmosphere (e.g., aerobic or anaerobic), and/or timing incubation). In step 610, the chip is split and/or duplicated (using, e.g., a picker), resulting in two portions of cultivated cells according to methods described herein. For example, the at least one membrane may be peeled off such that a portion of the cultivated cells remain attached or peeled off or punctured to sample the cultivated cells. In optional step 612, one portion of the cultivated cells is sacrificed for identification. Step 612 may include PCR, sequencing, and/or various data analytics. In step 614, strains of interest are identified. Further cultivation, testing, and/or identification may be performed with, for example, the strains of interest and/or the remaining portion of the cultivated cells.

FIG. 7 is a diagram illustrating a method for isolating and cultivating cells from a complex sample in accordance with some embodiments. Panel 700 shows examples of complex samples, specifically a microbiome sample 702 and a soil sample 704. In Panel 706, at least one cell is extracted from the sample using, for example, the protocol illustrated in FIGS. 5A and 5B. In Panel 708, the at least one extracted cell (and any environmental extract and/or dilutant) is loaded on a microfabricated device or chip with at least one high density microwell array 710. Chip 710 and a reagent cartridge 712 may be loaded into an incubator 714. The reagent may be useful for adding liquid to maintain nutritional requirements for growth and/or various screening purposes. Panel 716 shows the output: isolated strains of cultivated cells.

To identify the species or taxonomic lineage of cells or microorganisms growing in a microwell requires techniques including, but not limited to, DNA sequencing, nucleic acid hybridization, mass spectrometry, infrared spectrometry, DNA amplification, and antibody binding to identify genetic elements or other species identifiers. Many identification methods and process steps kill the microorganisms and therefore prevent further cultivation and study of microorganisms of interest. To enable both the identification of cells or microorganisms while enabling subsequent cultivation, study, and further elaboration of particular clones of interest, further embodiments are designed for sampling each experimental unit, well, or microwell across a substrate or chip while maintaining the locational integrity and separation of microorganism populations across experimental units, wells, or microwells.

A substrate as described above may enable sampling a cell population using further systems, kits, apparatus, and methods. For example, a picking device may be applied to a first surface of the substrate. The device may include at least one protrusion facing the first surface. The at least one protrusion has a diameter less than the opening diameter of each microwell, well, or experimental unit. The at least one protrusion may be inserted into at least one microwell, well, or experimental unit holding a population of cells such that a portion of the population of cells in the at least one microwell, well, or experimental unit adheres and/or attaches to the at least one protrusion. The sample of the population of cells in the at least one microwell, well, or experimental unit may be withdrawn by removing the device from the first surface of the substrate such that the portion of the population of cells in the at least one microwell, well, or experimental unit remains adhered and/or attached to the at least one protrusion. Each protrusion may be a pin or a plurality or assembly of pins.

FIGS. 8A-8C are diagrams illustrating picking by one pin or multiple pins in accordance with some embodiments. Chip 800 is provided for inspection via a microscope 802 and picking via picking control device 804. In FIG. 8A, picking control device 804 comprises an arm with a single pin 806. In FIG. 8B, an arm with multiple pins 808 is shown. FIG. 8C is a perspective view of the chip during the picking process.

FIGS. 9A-9D are images demonstrating picking of a well in accordance with some embodiments. In FIG. 9A, the well is full. In FIG. 9B, the pin is moved into position. In FIG. 9C, the well is picked. In FIG. 9D, a sample is removed from the well.

FIGS. 10A-10D are diagrams illustrating a tool for picking a chip in accordance with some embodiments. In FIG. 10A, a tool comprising a plurality of pins is aligned with a chip having a plurality of wells. In FIG. 10B, the tool is lowered such that the pins are dipped into the wells. In FIG. 10C, the pins are shown with samples attached, and the samples are transferred to a new chip. Alternatively, in FIG. 10D, the tool is flipped such that the samples may be maintained in the tool itself.

FIG. 11 is an image of a well that has been picked through a thin layer of agar, illustrating picking through a membrane or sealing layer in accordance with some embodiments.

Alternatively, when the at least one protrusion is inserted into the at least one microwell, well, or experimental unit, a portion of the population of cells in the at least one the at least one microwell, well, or experimental unit is volume displaced up and around the at least one protrusion such that at least some of the volume displaced portion is above the first surface of the substrate and/or the inner surface of the at least one microwell, well, or experimental unit. The method also includes sampling the population of cells in the at least one microwell by collecting at least some of the volume displaced portion of the population of cells.

A similar picking device may be applied to a second surface opposite the first surface of the substrate. The device may include at least one protrusion facing the second surface. The at least one protrusion has a diameter about equal to or less than a diameter of at least one microwell, well, or experimental unit. The at least one protrusion is pushed against the second surface at a location corresponding to the at least one microwell, well, or experimental unit holding a population of cells and/or inserted into the at least one microwell, well, or experimental unit holding the population of cells such that a portion of the population of cells in the at least one microwell, well, or experimental unit is displaced above the first surface of the substrate and/or the inner surface of the at least one microwell, well, or experimental unit. The displaced portion of the population of cells may then be collected. The population of cells may be located on a plug (e.g., a hydrogel or other soft material like agar) in the at least one experimental unit, well, or microwell such that when the at least one protrusion is at least one of pushed against the second surface and inserted into the at least one microwell, the plug is displaced, thereby displacing the portion of the population of cells.

The sample of the population of cells from the at least one experimental unit, well, or microwell may be deposited in a second location. The at least one protrusion may be cleaned and/or sterilized prior to further sampling. At least a portion of the at least one protrusion may be composed of a material, treated, and/or coated with a surface chemistry modifier for surface characteristics that favor attachment of cells. The at least one protrusion may be an array of protrusions. Upon applying the device to the first surface of the substrate, the array of protrusions may be inserted into a corresponding array of experimental units, wells, or microwells. The number of protrusions in the array of protrusions may correspond to the number of experimental units in the first array, the number of microwells in one second array of microwells, or the total number of microwells in the substrate.

Another device for sampling a cell population in a substrate includes at least one needle and/or nanopipette facing the first surface. The at least one needle and/or nanopipette has an external diameter less than the opening diameter of each microwell and an internal diameter capable of accommodating a target cell diameter. The at least one needle and/or nanopipette is inserted into at least one experimental unit, well, or microwell holding a population of cells. The sample of the population of cells in the at least one experimental unit, well, or microwell is withdrawn using pressure to pull a portion of the population of cells from the at least one experimental unit, well, or microwell into the device.

The sample of the population of cells from the at least one experimental unit, well, or microwell may be deposited in a second location. The at least one needle and/or nanopipette may be cleaned and/or sterilized prior to further sampling. The at least one needle and/or nanopipette may be an array of needles and/or nanopipettes. Upon applying the device to the first surface of the microfabricated substrate, the array of needles and/or nanopipettes may be inserted into a corresponding array of experimental units, wells, or microwells. The number of needles and/or nanopipettes in the array of needles and/or nanopipettes may correspond to the number of the experimental units in the first array, the number of microwells in one second array of microwells, or the total number of microwells in the substrate.

Another method for sampling a cell population in a substrate includes applying focused acoustic energy to at least one experimental unit, well, or microwell holding a population of cells in fluid. The focused acoustic energy may be applied in a manner effective to eject a droplet from the at least one microwell, such as, for example, acoustic droplet ejection (ADE) (see, e.g., Sackmann et al., “Acoustical Micro- and Nanofluidics: Synthesis, Assembly and Other Applications,” Proceedings of the 4th European Conference on Microfluidics (December 2014)). The droplet may include a sample of the population of cells in the at least one experimental unit, well, or microwell. The droplet may be directed into a second container or surface or substrate.

A substrate may include at least a first piece including at least a portion of the first surface and a second piece including at least a portion of the second surface. The first piece and the second piece are detachably connected along at least a portion of a plane parallel to the first surface and the second surface. The plane divides the experimental units, wells, or microwells. A cell population in at least one experimental unit, well, or microwell is sampled by detaching the first piece and the second piece such that a first portion of the population of cells in the at least one experimental unit, well, or microwell remains attached to the first piece and a second portion of the population of cells in the at least one experimental unit, well, or microwell remains attached to the second piece.

FIG. 12 is a diagram illustrating a cross-section of a chip 1200 in accordance with some embodiments. Chip 1200 includes a substrate defining an array of wells 1202 filled with contents 1204. The substrate comprises a first piece 1206 and a second piece 1208. The first piece 1206 and the second piece 1208 are detachably connected along a plane 1210 parallel to and bisecting the array of wells 1202. When the first piece 1206 and the second piece 1208 are detached, the wells 1202 and their contents 1204 are divided, resulting in two copies of the contents 1204 that preserve both the isolation and the location of the contents 1204 on chip 1200.

Each microwell, experimental unit, or microchannel may include a partial barrier that partially separates the microwell, experimental unit, or microchannel into a first portion and a bottom portion such that a cell population is able to grow in both the first portion and the bottom portion. Prior to sampling the population of cells, the above methods may include dispersing and/or reducing clumps of cells in the population of cells. Dispersing and/or reducing clumps of cells in the population of cells may include, but is not limited to, applying sonication, shaking, and dispension with small particles.

The above methods further may include depositing the sample of the population of cells from the at least one experimental unit, well, or microwell in a second location. The second location may be a corresponding array of experimental units, wells, or microwells. The second location may be a single receptacle. The sample of the population of cells from the at least one experimental unit, well, or microwell may be maintained for subsequent cultivation. Alternatively, the remaining cells of the population of cells in the at least one experimental unit, well, or microwell may be maintained for subsequent cultivation.

The above methods further may include identifying at least one cell from the sample of the population of cells and/or the remaining cells of the population of cells. This may include performing DNA, cDNA, and/or RNA amplification, DNA and/or RNA sequencing, nucleic acid hybridization, mass spectrometry, and/or antibody binding. Alternatively, or in addition, this may include identifying an experimental unit, well, or microwell from which at least one cell originated. Each experimental unit, well, or microwell may be marked with a unique tag including a location-specific nucleotide sequence. To identify the experimental unit, well, or microwell, a location-specific nucleotide sequence may be identified in the sequencing and/or amplification reaction, and the location specific nucleotide sequence may be correlated with the at least one experimental unit, well, or microwell from which the at least one cell originated.

A microfabricated device as described above may enable culturing cells in a sample derived from an environment using further systems, kits, apparatus, and methods. For example, a sample may be applied to the first surface of a substrate such that at least one of the cells occupies at least one microwell, well, or experimental unit. A semi-permeable membrane is applied to at least a portion of the first surface (e.g., at least a portion of an inner surface of an experimental unit or well) such that a nutrient can diffuse into the at least one microwell, well, or experimental unit. Meanwhile, escape of the occupying cells from the at least one microwell, well, or experimental unit is prevented and/or mitigated. A semi-permeable membrane may be, for example, a hydrogel layer. A semi-permeable membrane may be reversibly or irreversibly connected or affixed to the substrate using, for example, lamination. Thus, the occupying cells may be incubated in the at least one microwell, well, or experimental unit with at least one nutrient. The cells may be gradually transitioned over a period of time from at least one nutrient to at least one alternative nutrient or nutrient formulation using progressive partial exchange, thereby undergoing domestication or adaptation.

A first nutrient derived from the environment may be used to incubate the cells occupying at least one first experimental unit, well, or microwell, and a second nutrient derived from the environment may be used to incubate the cells occupying at least one second experimental unit, well, or microwell. The above methods may include comparing the cells occupying the at least one first experimental unit, well, or microwell with the cells occupying at least one second experimental unit, well, or microwell to analyze the first nutrient and the second nutrient.

For example, a method may include one or more of the following steps:

-   -   Acquire a chip defining 1000 to 10 million or more microwells         within a number of larger wells or flow cells, each microwell         having a diameter of about 1 μm to about 800 μm and a depth of         about 1 μm to about 800 μm, the chip further having one or more         surface chemistries configured to facilitate the movement of         target microorganisms into the microwells;     -   Apply an environmental sample or a derivative of the         environmental sample to the chip such that any target         microorganisms become located in the microwells;     -   Place one or more semi-permeable filters, hydrogel layers, or         other barriers on the chip such that a barrier is created that         allows nutrients to diffuse into the microwells but prevents         and/or mitigates escape of microorganisms from the microwells;     -   Incubate the chip with at least one nutrient (e.g., derived from         the environment);     -   Gradually change the nutrient source by progressive partial         exchange with at least one alternative nutrient (e.g.,         formulation); and     -   Detect any growth of microorganisms in the microwells.

The target cells may be Archaea, Bacteria, or Eukaryota. Target viruses may be bacteriophages. When viruses are targeted, the microwells of the chip may also include host cells in which the viruses may grow. Detecting the growth of the occupying cells or viruses may include detecting a change in biomass (e.g., DNA/RNA/protein/lipid), metabolite presence or absence, pH, consumption of nutrients, and/or consumption of gases. Detecting the growth of the occupying cells or viruses may include performing real-time sequential imaging, microscopy, optical density, fluorescence microscopy, mass spectrometry, electrochemistry, amplification (DNA, cDNA, and/or RNA), sequencing (DNA and/or RNA), nucleic acid hybridization, and/or antibody binding.

FIG. 13 is a flowchart illustrating methods for screening in accordance with some embodiments. In step 1300, a sample is obtained. In step 1302, at least one cell is extracted from the obtained sample. In step 1304, at least one high density microwell array of a microfabricated device or chip is loaded with the at least one extracted cell. Step 1304 may include preparing a cell concentration with the at least one extracted cell, selecting at least one nutrient/media, and/or selecting at least one membrane. In step 1306, at least a portion of the microwell array is sealed with the at least one selected membrane to retain the cell concentration with the microwells. In step 1308, the chip is incubated. Step 1308 may include selecting a temperature, determining atmosphere (e.g., aerobic or anaerobic), and/or timing incubation). A genetic screen and/or a functional screen may be performed. In step 1310, a genetic screen is applied to the chip. In step 1312, the chip is split and/or duplicated (using, e.g., a picker), resulting in two portions of cultivated cells according to methods described herein. For example, the at least one membrane may be peeled off such that a portion of the cultivated cells remain attached or peeled off or punctured to sample the cultivated cells. In optional step 1314, one portion of the cultivated cells is sacrificed for identification. Step 1314 may include PCR, sequencing, and/or various data analytics. In step 1316, strains of interest are identified. Further cultivation, testing, and/or identification may be performed with, for example, the strains of interest and/or the remaining portion of the cultivated cells. Alternatively, in step 1318, a functional screen is applied to the chip. In step 1320, one or more variables are observed and, as in step 1316, strains of interest are identified.

FIG. 14 is a diagram illustrating a screening method in accordance with some embodiments. Panel 1400 shows examples of complex samples, specifically a microbiome sample 1402 and a soil sample 1404. In Panel 1406, at least one cell is extracted from the sample using, for example, the protocol illustrated in FIGS. 5A and 5B. In Panel 1408, the at least one extracted cell (and any environmental extract and/or dilutant) is loaded on a microfabricated device or chip with at least one high density microwell array 1410. Chip 1410 and a reagent cartridge 1412 may be loaded into an incubator 1414. The reagent may be useful for adding liquid to maintain nutritional requirements for growth and/or various screening purposes. Panel 1416 shows the output: screen results and isolated strains of cultivated cells.

FIG. 15 is a series of images illustrating a screening example in accordance with some embodiments. The images show portions of a chip with a membrane and an acid-sensitive layer applied thereon to screen for low pH. In image 1500, more than 1800, 50-μm microwells are visible with nine clear hits 1502. Image 1504 is a magnified view of box 1504, and image 1506 is a magnified view of one of the microwells with a hit 1502.

FIGS. 16A-16C are images illustrating recovery from a screen in accordance with some embodiments. In FIG. 16A, at least one well is picked using a microscope and a picking device with at least one pin. In FIG. 16B, a pin is removed and incubated in media. In FIG. 16C, growth is visible.

FIG. 17A is an exploded diagram illustrating a chip for screening in accordance with some embodiments. In FIG. 17A, chip 1700 includes a high density array of microwells with, for example, soil microbes in the microwells. Membrane 1702 is applied to chip 1700. Gasket 1704 is applied to chip 1700 over membrane 1702. Agar with fluorescent E. coli bacteria 1706 is applied to chip 1700 over gasket 1704 and membrane 1702. FIGS. 17B and 17C are images illustrating a screening example in accordance with some embodiments. In this example, the screen is for clearance zones. FIG. 17B is a fluorescence image of a chip, prepared like chip 1700 in FIG. 17A, following the screen. FIG. 17C is an image showing a process of picking a sample from this chip through the agar.

In some embodiments, a location on an apparatus may be correlated with a portion of a sample present at that location, after that portion of the sample (or a part of the portion) is removed from the apparatus. The apparatus may be or include a microarray. The microarray may comprise a plurality of locations for applying a sample, wherein each location is marked with a unique tag which may be used to identify the location from which a portion of the sample came, after that portion of the sample is removed from the microarray.

The disclosure relates to a method of identifying from which location on a microarray a portion of a sample comprising at least one nucleic acid molecule came, after that portion of the sample is removed from the microarray, the method comprising the steps of: (a) applying one or more portions of the sample onto one or more of a plurality of locations on the microarray, wherein each location is marked with a unique tag comprising a nucleic acid molecule comprising: (i) a location-specific nucleotide sequence; and (ii) a first target-specific nucleotide sequence; (b) allowing the target nucleic acid molecule found in at least one portion of the sample to anneal to a tag marking a location; (c) performing primer extension, reverse transcription, single-stranded ligation, or double-stranded ligation on the population of annealed nucleic acid molecules, thereby incorporating a location-specific nucleotide sequence into each nucleic acid molecule produced by primer extension, reverse transcription, single-stranded ligation, or double-stranded ligation; (d) combining the population of nucleic acid molecules produced in step (c); (e) sequencing the population of combined nucleic acid molecules, thereby obtaining the sequence of one or more location-specific nucleotide sequences; and (f) correlating the sequence of at least one location-specific nucleotide sequence obtained from the population of combined nucleic acid molecules to the location on the microarray marked with a tag comprising said location-specific nucleotide sequence; thereby identifying from which location on a microarray a portion of a sample comprising at least one nucleic acid molecule came. In some embodiments, a sample may include at least one cell and one or more nucleic acid molecules are released from the cell after step (a) and before step (b). A sample may include at least one cell, and the at least one cell replicates or divides after step (a) and before step (b). A portion of the portion of the sample may be removed from at least one location before step (b) and said portion of the portion of the sample may be stored in a separate receptacle correlated to the original location of the portion of the sample on the microarray. The method of correlating or identifying a location may further comprise the step of amplifying the nucleic acid molecules produced in step (c) or the population of combined nucleic acid molecules produced in step (d). The amplifying step may comprise polymerase chain reaction amplification, multiplexed polymerase chain reaction amplification, nested polymerase chain reaction amplification, ligase chain reaction amplification, ligase detection reaction amplification, strand displacement amplification, transcription based amplification, nucleic acid sequence-based amplification, rolling circle amplification, or hyper-branched rolling circle amplification. Additional primers may be added during an amplification reaction. For example, both 5′ and 3′ primers may be needed for a PCR reaction. One of the primers used during an amplification reaction may be complementary to a nucleotide sequence in the sample.

In some embodiments, a composition including cells and/or viruses may be treated with a nuclease before the composition is applied to a microfabricated device so that contaminating nucleic acid molecules are not amplified in subsequent steps.

The sequencing used in the disclosed methods and apparatuses may be any process of obtaining sequence information, including hybridization and use of sequence specific proteins (for example, enzymes). Sequencing may comprise Sanger sequencing, sequencing by hybridization, sequencing by ligation, quantitative incremental fluorescent nucleotide addition sequencing (QIFNAS), stepwise ligation and cleavage, fluorescence resonance energy transfer, molecular beacons, TaqMan reporter probe digestion, pyrosequencing, fluorescent in situ sequencing (FISSEQ), wobble sequencing, multiplex sequencing, polymerized colony (POLONY) sequencing (see, e.g., U.S. Patent Application Publication No. 2012/0270740, which is incorporated by reference herein in its entirety); nanogrid rolling circle (ROLONY) sequencing (see, e.g., U.S. Patent Application Publication No. 2009/0018024, which is incorporated by reference herein in its entirety), allele-specific oligo ligation assay sequencing, or sequencing on a next-generation sequencing (NGS) platform. Non-limiting examples of NGS platforms include systems from Illumina® (San Diego, Calif.) (e.g., MiSeg™, NextSeg™ HiSeq™, and HiSeq X™), Life Technologies (Carlsbad, Calif.) (e.g., Ion Torrent™), and Pacific Biosciences (Menlo Park, Calif.) (e.g., PacBio® RS II).

An organism or species may be identified by comparing the nucleic acid sequence obtained from that organism to various databases containing sequences of organisms. For example, ribosomal RNA sequence data is available in the SILVA rRNA database project (Max Planck Institute for Marine Microbiology, Bremen, Germany (www.arb-silva.de); see, e.g., Quast et al., “The SILVA Ribosomal RNA Gene Database Project: Improved Data Processing and Web-Based Tools,” 41 Nucl. Acids Res. D590-D596 (2013), and Pruesse et al., “SINA: Accurate High-Throughput Multiple Sequence Alignment of Ribosomal RNA Genes,” 28 Bioinformatics 1823-1829 (2012), both of which are incorporated by reference herein in their entirety). Other ribosomal RNA sequence databases include the Ribosomal Database Project (Michigan State University, East Lansing, Mich. (www.rdp.cme.msu.edu); see, e.g., Cole et al., “Ribosomal Database Project: Data and Tools for High Throughput rRNA Analysis” 42 Nucl. Acids Res. D633-D642 (2014), which is incorporated by reference herein in its entirety) and Greengenes (Lawrence Berkeley National Laboratory, Berkeley, Calif. (www.greengenes.lbl.gov); see, e.g., DeSantis et al., “Greengenes, a Chimera-Checked 16S rRNA Gene Database and Workbench Compatible with ARB,” 72 Appl. Environ. Microbiol. 5069-72 (2006), which is incorporated by reference herein in its entirety). The GenBank® genetic sequence database contains publicly available nucleotide sequences for almost 260,000 formally described species (National Institutes of Health, Bethesda, Md. (www.ncbi.nlm.nih.gov); see, e.g., Benson et al., “GenBank,” 41 Nucl. Acids Res. D36-42 (2013).

The sequence used for matching and identification may include the 16S ribosomal region, 18S ribosomal region or any other region that provides identification information. The desired variant may be a genotype (e.g., single nucleotide polymorphism (SNP) or other type of variant) or a species containing a specific gene sequence (e.g., a sequence coding for an enzyme or protein). An organism or species may also be identified by matching its sequence to a custom internal sequence database. In some cases, one may conclude that a certain species or organism is found at a location on the microarray if the sequence obtained from the portion of the sample at the location has at least a specified percentage identity (e.g., at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identity) to the known DNA, cDNA, or RNA sequence obtained from that species or microorganism.

The disclosure further relates to a method of manufacturing a microarray comprising a plurality of locations for applying a sample, wherein at least one location is marked with a unique tag, the method comprising the steps of: (a) synthesizing a plurality of tags, wherein each tag comprises a nucleic acid molecule comprising: (i) a location-specific nucleotide sequence; and (ii) a target-specific nucleotide sequence; and (b) placing a tag on at least one location of the plurality of locations on the microarray. In an alternative embodiment, the disclosure relates to a method of manufacturing a microarray comprising a plurality of locations for applying a sample, wherein at least one location is marked with a unique tag, the method comprising the steps of: (a) synthesizing a plurality of tags, wherein each tag comprises a nucleic acid molecule comprising: a target-specific nucleotide sequence and not comprising a location-specific nucleotide sequence; and (b) placing a tag on at least one location of the plurality of locations on the microarray. The target-specific sequence may be the same at every location in the microarray. In either of the above embodiments, step (a) may be performed before step (b). The placing step (b) may comprise placing the tag at each location by a liquid handling procedure (for example, pipetting, spotting with a solid pin, spotting with a hollow pin, or depositing with an inkjet device). At least one tag may include a nucleic acid molecule or a portion of a nucleic acid molecule that is pre-synthesized. Step (a) may be performed simultaneously with step (b). In certain embodiments, at least one tag comprises a nucleic acid molecule that is synthesized at each location by in situ synthesis. The synthesizing step (a) may comprise inkjet printing synthesis or photolithography synthesis.

Each location on a microarray may be configured to receive a portion of the sample. A location may be tagged or labeled with a nucleic acid molecule (e.g., an oligonucleotide) that comprises at least one of: (i) a location-specific nucleotide sequence (e.g., a barcode); and (ii) a target-specific nucleotide sequence. A target-specific nucleotide sequence may complement or substantially complement a nucleotide sequence found in the sample. The order of the nucleotide sequences from the 5′ end to the 3′ end in the nucleic acid molecule may be: (1) a location-specific nucleotide sequence; and (2) a target-specific nucleotide sequence. Alternatively, the order of the nucleotide sequences from the 5′ end to the 3′ end in the nucleic acid molecule may be (2) then (1). The nucleic acid molecule may be attached at its 5′ end to the microarray. One or more locations on the apparatus (e.g., microarray) may be untagged or unlabeled.

The terms “complementary” or “substantially complementary” may refer to the hybridization, the base pairing, or the formation of a duplex between nucleotides or nucleic acids, such as, for instance, between the two strands of a double stranded DNA molecule or between an oligonucleotide primer and a primer binding site on a single stranded nucleic acid. Complementary nucleotides are, generally, A and T/U, or C and G. Two single-stranded RNA or DNA molecules are said to be substantially complementary when the nucleotides of one strand, optimally aligned and compared and with appropriate nucleotide insertions or deletions, pair with at least about 80% of the nucleotides of the other strand, usually at least about 90% to 95%, and more preferably from about 98 to 100%. Alternatively, substantial complementarity exists when an RNA or DNA strand will hybridize under selective hybridization conditions to its complement. Typically, selective hybridization will occur when there is at least about 65% complementary over a stretch of at least 14 to 25 nucleotides, at least about 75%, or at least about 90% complementary.

The term “selectively hybridize” or “selective hybridization” may refer to binding detectably and specifically. Polynucleotides, oligonucleotides and fragments thereof selectively hybridize to nucleic acid strands under hybridization and wash conditions that minimize appreciable amounts of detectable binding to nonspecific nucleic acids. “High stringency” or “highly stringent” conditions can be used to achieve selective hybridization conditions as known in the art and discussed herein. An example of “high stringency” or “highly stringent” conditions is a method of incubating a polynucleotide with another polynucleotide, wherein one polynucleotide may be affixed to a solid surface such as a membrane, in a hybridization buffer of 6×SSPE or SSC, 50% formamide, 5×Denhardt's reagent, 0.5% SDS, 100 μg/ml denatured, fragmented salmon sperm DNA at a hybridization temperature of 42° C. for 12-16 hours, followed by twice washing at 55° C. using a wash buffer of 1×SSC, 0.5% SDS.

The nucleic acid molecule that is part of a location tag may comprise at least one deoxyribonucleotide or at least one ribonucleotide. The nucleic acid molecule may be single-stranded or double-stranded. A nucleic acid molecule may be a double-stranded molecule having a single-stranded overhang.

In some embodiments, the location tag may be used to amplify a nucleic acid molecule that anneals to it. Thus, the location tag may comprise a nucleic acid sequence that further comprises an amplification primer binding site. An amplification primer binding site may be at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, or at least 30 nucleotides in length. The order of the nucleotide sequences from the 5′ end to the 3′ end in the nucleic acid molecule may be, for example: (1) the amplification primer binding site; (2) the location-specific nucleotide sequence; and (3) the target-specific nucleotide sequence.

In some embodiments, a nucleic acid molecule may comprise a target-specific nucleotide sequence without comprising a location-specific nucleotide sequence. In certain embodiments, a nucleic acid molecule may comprise a target-specific nucleotide sequence without comprising either a location-specific nucleotide sequence or an amplification binding site sequence. In further embodiments, a nucleic acid molecule may comprise only a target-specific nucleotide sequence. In even further embodiments, a nucleic acid molecule may contain only a target-specific nucleotide sequence. The amplification primer binding site may be capable of binding to a polymerase chain reaction primer, a multiplexed polymerase chain reaction primer, a nested polymerase chain reaction primer, a ligase chain reaction primer, a ligase detection reaction primer, a strand displacement primer, a transcription based primer, a nucleic acid sequence-based primer, a rolling circle primer, or a hyper-branched rolling circle primer. Additional primers may be added to the microarray during an amplification reaction. For example, both 5′ and 3′ primers may be needed for a PCR reaction. Target-specific nucleotide sequences may be amplified in the locations containing target nucleic acid molecules and may be detected by, for example, qPCR, end point PCR, and/or dyes to detect amplified nucleic acid molecules.

It may be desirable to sequence a nucleic acid molecule that anneals to a location tag or the amplified product based on such a nucleic acid molecule. The location tag may comprise a nucleic acid sequence that further comprises an adapter nucleotide sequence. In certain embodiments, an adapter nucleotide sequence may not be found in the location tag but is added to the sample nucleic acid molecules in a secondary PCR reaction or by ligation. An adapter nucleotide sequence may be a generic adapter or an adapter for a specific sequencing platform (e.g., Illumina® or Ion Torrent™). An adapter nucleotide sequence may include a sequencing primer binding site. A sequencing primer binding site may be capable of binding a primer for Sanger sequencing, sequencing by hybridization, sequencing by ligation, quantitative incremental fluorescent nucleotide addition sequencing (QIFNAS), stepwise ligation and cleavage, fluorescence resonance energy transfer, molecular beacons, TaqMan reporter probe digestion, pyrosequencing, fluorescent in situ sequencing (FISSEQ), wobble sequencing, multiplex sequencing, polymerized colony (POLONY) sequencing (see, e.g., US 2012/0270740); nanogrid rolling circle (ROLONY) sequencing (see, e.g., US 2009/0018024), allele-specific oligo ligation assay sequencing, sequencing on an NGS platform, or any suitable sequencing procedure. Non-limiting examples of NGS platforms include systems from Illumina® (San Diego, Calif.) (e.g., MiSeg™, NextSeg™, HiSeg™, and HiSeq X™), Life Technologies (Carlsbad, Calif.) (e.g., Ion Torrent™), and Pacific Biosciences (Menlo Park, Calif.) (e.g., PacBio® RS II).

A location-specific nucleotide sequence (e.g., a barcode) may be at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25, at least 26, at least 27, at least 28, at least 29, or at least 30 nucleotides in length.

A target-specific nucleotide sequence may be at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25 nucleotides, at least 26, at least 27, at least 28, at least 29, at least 30, at least 40, at least 50, at least 75, or at least 100 nucleotides in length.

At least one location on a microarray may be further marked with a unique molecular identifier tag. Unique molecular identifiers may be used to quantify growth (e.g., growth of a microorganism colony or replication of cells at the location). Unique molecular identifiers may be random nucleotide sequences. Methods using unique molecular identifiers and examples of unique molecular identifiers have been described in the art, see, e.g., WO 2013/173394, which is incorporated by reference herein in its entirety. For example, a unique molecular identifier tag may have the nucleotide sequence NNNANNNCNNNTNNNGNNNANNNCNNN (SEQ ID NO:1), wherein the Ns (equal random mix of ACGT) create a large encoding space so that each molecule amplified gets a unique (specific) DNA sequence barcode (4{circumflex over ( )}N barcodes, or 4{circumflex over ( )}21˜4 trillion in this example) This sequence can be counted without interference from amplification bias or other technical problems. The fixed bases in SEQ ID NO:1 (the A, C, G, T) help with reading the barcode accurately, e.g., handling indels.

The present disclosure encompasses using location-specific tags to monitor the presence or amount of more than one target-specific nucleotide sequence in a sample (e.g., multiplexing). At least one location on a microarray may be further marked with a second unique tag comprising a nucleic acid molecule comprising, for example: (i) an amplification primer binding site; (ii) a location-specific nucleotide sequence; and (iii) a target-specific nucleotide sequence.

In some embodiments, a nucleic acid molecule may comprise a target-specific nucleotide sequence without comprising a location-specific nucleotide sequence. In certain embodiments, a nucleic acid molecule may comprise a target-specific nucleotide sequence without comprising either a location-specific nucleotide sequence or an amplification binding site sequence. In further embodiments, a nucleic acid molecule may comprise only a target-specific nucleotide sequence. In even further embodiments, a nucleic acid molecule may contain only a target-specific nucleotide sequence. The target-specific nucleotide sequence may be at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, at least 18, at least 19, at least 20, at least 21, at least 22, at least 23, at least 24, at least 25 nucleotides, at least 26, at least 27, at least 28, at least 29, at least 30, at least 40, at least 50, at least 75, or at least 100 nucleotides in length. In certain embodiments, the target-specific sequence may be the same at every location in the microarray. Additional target-specific nucleotide sequences may be monitored. For example, one or more locations may be marked with at least 10, at least 25, at least 50, at least 75, or at least 100 unique tags, wherein each tag comprises a target-specific nucleotide sequence that is different from the other target-specific nucleotide sequences in the tags at that location.

Any genetic locus of interest may provide a target-specific nucleotide sequence. For example, sequences of bacterial 16S ribosomal RNA (rRNA), 18S ribosomal RNA, poly(A) RNA, an RNA polymerase gene, a DNA polymerase gene, the RecA gene, a transposase gene, ribosomal internal transcribed spacer (ITS) sequences, a gene encoding an enzyme, control region DNA sequences, binding site DNA sequences, or a portion of any of these sequences may serve as a target-specific nucleotide sequence. A disclosed system, kit, apparatus, or method may use one or more of the bacterial 16S rRNA primers described in Sundquist et al., “Bacterial Flora-Typing with Targeted, Chip-Based Pyrosequencing,” 7:108 BMC Microbiology (2007) and Wang et al., “Conservative Fragments in Bacterial 16S rRNA Genes and Primer Design for 16S Ribosomal DNA Amplicons in Metagenomic Studies,” 4:10 PLoS ONE e7401 (2009), each of which is incorporated herein by reference in its entirety.

A sample used in the disclosed apparatuses and methods may comprise a plurality of nucleic acid molecules. A sample may comprise at least one DNA molecule or at least one RNA molecule. A sample may comprise at least one nucleic acid molecule formed by restriction enzyme digestion. A sample may comprise at least one cell (e.g., an archaebacterial cell, a eubacterial cell, a fungal cell, a plant cell, and/or an animal cell). A sample may comprise at least one microorganism. A sample may comprise one or more viruses (e.g., a bacteriophage), for which host cells may need to be provided. A portion of a sample at a location on a microarray may be a single cell or a colony grown from a single cell. For example, individual microorganisms or cells may be placed in microwells and the individual microorganisms or cells may be allowed to divide or replicate so that a colony grows within each microwell that had an individual microorganism or cell placed in it. A location on a microarray may thus contain a single microorganism species or a mixed community of microorganism strains that support one another's growth. A sample may comprise any suitable dilutant. In non-limiting examples, a sample comprises soil, sewage, fecal matter, contents of a body cavity, a biological fluid, living organic matter, dead organic matter, a microbial suspension, naturally-sourced freshwater, drinking water, seawater, wastewater, supercritical carbon dioxide, a mineral, a gas, a buffer, alcohol, an organic solvent, and/or an oil. In some embodiments, a nucleic acid molecule comprising (a) (i) a location-specific nucleotide sequence and (ii) one or more target-specific nucleotide sequences; or (b) one or more target-specific nucleotide sequences (i.e., not comprising a location-specific nucleotide sequence) is placed on at least one location on a microarray before a portion of a sample is placed at the location. In other embodiments, a nucleic acid molecule comprising (a) (i) a location-specific nucleotide sequence and (ii) one or more target-specific nucleotide sequences; or (b) one or more target-specific nucleotide sequences (i.e., not comprising a location-specific nucleotide sequence) is placed on at least one location on a microarray after a portion of a sample is placed at the location. In one example, a sample or a portion of a sample may be placed on a microarray and incubated before a nucleic acid molecule comprising at least one of: (i) a location-specific nucleotide sequence and (ii) a target-specific nucleotide sequence is placed on the microarray. In some embodiments, a portion of the portion of a sample may be removed from at least one location on the microarray and stored in a separate receptacle or the microarray may be split either before or after the nucleic acid molecules are placed on at least one location on the microarray.

At least one location-specific tag may comprise a nucleic acid molecule or a portion of a nucleic acid molecule that is pre-synthesized and placed at the location by a liquid handling procedure. For instance, a liquid handling procedure may be pipetting, spotting with a solid pin, spotting with a hollow pin, or depositing with an inkjet device. A tag may be generated at the location using multiple nucleic acid molecules that are pre-synthesized separately. At least one tag may comprise a nucleic acid molecule that is synthesized at the location by in situ synthesis (e.g., by inkjet printing or by photolithography).

Digital Enumeration of Species

A high density chip device comprised of a surface having high density microwells is described herein. Microbes from a microbiome sample may be diluted and applied to the device such that wells contain approximately one microbe per occupied well. The chip then may be incubated such that the microbes replicate within the wells. Further, a DNA based locational indexing system is described herein to determine what species is present in each well. This indexing system may involve having PCR primers preloaded into each well that contain addressing barcodes that identify the well and a primer sequence targeted to a specific genetic element (e.g., 16S) in the microbial genome that provides species information or targets a desired genetic sequence. After incubation, the microbial DNA is released, the PCR primers amplify the target bacterial DNA region, and the amplicons from the various wells on a chip are pooled and then may be read next generation sequencing.

The systems, kits, apparatus, and methodologies described herein may be utilized to perform an absolute count of the number of each microbial species or variant in a sample. Each well may represent a digital event which represents the presence of a single microbe in the original diluted sample. The locational indexing system may allow a user to determine what bacterial species is in the well. A unit of measurement may be “there is a bacterial species in a well” and may be independent of the number of bacteria in the well.

In one example, a mixed sample of microbes includes 50% Species 1, 30% Species 2, and 20% Species 3. The sample is diluted then applied to the chip such that each occupied well has, for the most part, one microbe. The microbe replicates. Note the replication rate may be different for different species. Then, the chip is processed such that the DNA from the microbes in the wells is released and the 16S or some other target sequence is amplified. The DNA amplification products from each well may be pooled and sequenced using next generation sequencing. The next generation sequencing data may be analyzed to determine, for each well, what species is in each occupied well. Many wells may not be occupied at all. The abundance of each species may be determined by: the total number of wells occupied by each species divided by the total number of occupied wells. An absolute abundance determination may be made by multiplying the % abundance of each species from step by the total number of microbes in the original sample. The sequencing data may be compared to publicly available sequence datasets to determine what species is in each occupied well. For example, ribosomal RNA sequence data is available in the SILVA rRNA database project described above. Other ribosomal RNA sequence databases include the Ribosomal Database Project, Greengenes, and the GenBank® genetic sequence database, also described above.

Current methods for estimating the abundance of microbial species in a sample involve the use of traditional techniques such as microscopy, staining, selective media, metabolic/physiological screens, and cultivation using petri dishes. These methods are often inaccurate due to lack of specificity (microscopy, staining, metabolic/physiological screens) or lack of ability to account for all species in a sample (selective media, cultivation) whereby many species do not grow well or do not grow at all with traditional approaches.

Current molecular methods for determining the relative abundance of microbial species in microbiome samples involve extracting microbial DNA from samples, performing PCR amplification of the 16S or some other DNA region that provide species or other information, then performing next generation sequencing (NGS) on the resulting PCR product. The relative abundance of each species in the original sample is inferred from the relative frequency of the species specific DNA sequence in the NGS data. There are many examples in the literature of this type of analysis and this method underpins much microbiome research.

The problem with the current methodology is that it does not control for different numbers of 16S gene that may exist in different microbes, PCR bias whereby sequences from different microbial species may be amplified at different rates, and sequencing bias where sequences from different microbial species may be sequenced at different rates. The result is that there is a lot of uncertainty with respect to the accuracy of relative abundance data derived using current methodologies.

The counting of different species may be based on the presence of a species in a single well. This is directly related to a single microbe from the original sample partitioning into the well during loading. Only PCR/NGS may be used to identify what microbial species exists in each well. The number of sequences identified does not form part of the calculation. Hence, it does not matter if there is PCR, NGS, or target sequence copy number variance or bias in the method.

Some embodiments may have applications in microbiome research, microbial product discovery and development, clinical diagnostics, and any other area where accurate counts of microbial species in a sample are required.

Accordingly, some embodiments may provide a much more accurate measurement of the relative abundance of each species in a microbiome sample, and the ability to convert this relative abundance measurement into an absolute abundance or a direct count of each species in the original sample (by accounting for the dilution and/or combining with a measurement of the total number of microbes in the original sample). Some embodiments may provide new applications for high density microfabricated chips (in addition to cultivation and screening of microbes).

FIG. 18 is a flowchart illustrating a counting method in accordance with some embodiments. In step 1800, a sample is obtained. In step 1802, at least one cell is extracted from the obtained sample. In step 1804, at least one high density microwell array of a microfabricated device or chip is loaded with the at least one extracted cell. Step 1804 may include preparing a cell concentration with the at least one extracted cell, selecting at least one nutrient/media, and/or selecting at least one membrane. In step 1806, at least a portion of the microwell array is sealed with the at least one selected membrane to retain the cell concentration with the microwells. In step 1808, the chip is incubated. Step 1808 may include selecting a temperature, determining atmosphere (e.g., aerobic or anaerobic), and/or timing incubation). In step 1810, the cultivated cells may be sacrificed for identification. Step 1810 may include PCR, sequencing, and/or various data analytics. In step 1812, information about the sample (e.g., a microbial community structure) may be assessed and/or determined.

FIG. 19 is a diagram illustrating a counting method in accordance with some embodiments. Panel 1900 shows examples of complex samples, specifically a microbiome sample 1902 and a soil sample 1904. In Panel 1906, at least one cell is extracted from the sample using, for example, the protocol illustrated in FIGS. 5A and 5B. In Panel 1908, the at least one extracted cell (and any environmental extract and/or dilutant) is loaded on a microfabricated device or chip with at least one high density microwell array 1910. Chip 1910 and a reagent cartridge 1912 may be loaded into an incubator 1914. The reagent may be useful for adding liquid to maintain nutritional requirements for growth and/or various screening purposes. Panel 1916 shows the output: sequences and relative abundance of cultivated cells.

Droplet-Based Platforms

A discrete droplet-based platform may be used to separate, cultivate, and/or screen in much the same way that chips are used. A droplet is an analog of a microwell serving as a nano- or picoliter vessel. Droplet generation methods, especially when combined with cell-sorter-on-a-chip type instrumentation, may be used to separate out microbes from a complex environmental sample. Droplet addition may be used to feed microbes. Droplet splitting may be used for sequencing or some other destructive testing while leaving behind a living sample. All the prep work necessary for sequencing may be done in droplet format as well.

Some embodiments may be used to get microbes out of a complex environment and into droplets. For example, a modular system for generating droplets containing cell suspensions may contain one or small numbers of cells. The aqueous drops may be suspended in a nonmiscible liquid keeping them apart from each other and from touching or contaminating any surfaces. Droplets may be generated at, for example, 30 Hz in each microchannel, which translates into millions per day.

A drop-based microfluidic system may encapsulate, manipulate, and/or incubate small drops (e.g., about 30 pL). Cell survival and proliferation is noted to be similar to control experiments in bulk solution. Droplets may be produced at several hundred Hz, meaning millions of drops can be produced in a few hours. A simple chip-based device may be used to generate droplets and the droplets may be engineered to contain a single cell.

Some embodiments may be used to screen cells in droplets. Fluorescence screening of droplets post-incubation may be done on-chip and at a rate of, for example, 500 drops per second. Droplets may be flowed through a channel at the focus of an epifluorescence microscope that may be configured for a number of different measurements. This may be a particularly effective way to do screening for metabolites as the local concentration is quite high on account of being confined to a very small droplet.

Some embodiments may be used to sort droplets. Once cells have been isolated, grown, and/or screened, they may be sorted so that useful samples may be retrieved. Droplets may be sorted in an analogous way to the commonly used FACS machine.

Some embodiments may be used to split droplets. Some embodiments may require the ability to take a sample and split it in order to send one portion to sequencing (a destructive process) and retain another portion that is a viable culture. There are a number of different ways to split droplets including, but not limited to, constructing T-junctions with carefully calculated dimensions that result in drops splitting as they flow by or electrowetting (taking care not to cause cell lysis with voltages that are too high).

Some embodiments may be used to merge droplets and/or add a reagent to a droplet. For example, long term incubation of cells (e.g., weeks) requires the ability to add liquid to maintain nutritional requirements for growth. It also may be useful to be able to add reagents for various screening purposes. Droplet screening relies on being able to merge a droplet containing a compound-code with a droplet containing a single cell. The droplets then may be incubated and/or returned to an assay chip to identify compounds via their codes. This may require the ability to precisely merge drops on an as-needed basis.

Some embodiments may be used to perform PCR in droplets. PCR may be used in order to ultimately sequence a specific genetic element (e.g., the 16S region) in order to identify microbes. This may be used to determine what type of microbe is growing in each well. In a droplet-based system this approach may be used to determine what microbe is present in each droplet as long as the correct primer sequence is designed to amplify the right region of the genome.

Some embodiments may be used to sequence DNA out of droplets (e.g., generated in the PCR step) and/or prepare DNA libraries.

Location Specific Tags for High Density Chips

A high density chip device having a surface with a high density of microwells may be used. Microbes from a microbiome sample may be diluted and applied to the device such that wells contain approximately one microbe per occupied well. The chip may be incubated such that the microbe replicates within the well and the resulting population represents a single species. A DNA-based locational indexing system may be used to determine what species is present in each well. This indexing system may involve having PCR primers preloaded into each well that contain addressing barcodes that identify the well, and a primer sequence targeted to a specific genetic element (e.g., 16S in the microbial genome) that provides species information. After incubation the microbial DNA may be released, the PCR primers may amplify the target bacterial DNA region, and the amplicons from the various wells on a chip may be pooled and then read by next generation sequencing.

The above locational indexing system may involve incorporating a different locational code for each well of the microchip, or multiple locational codes may be incorporated into each well such that the total number of codes required to code a specified number of wells is reduced. For example, if there are 100 wells in a chip it would require 100 codes if there is one code per well. The same chip could be coded with only 20 codes if two codes were read from each well (i.e., 10 coding for the x axis of the grid and 10 coding for the y axis).

An example of a PCR strategy to incorporate two codes per well is provided in TABLE 2.

TABLE 2 Primers Amplified PCR Products 5′-CODE1- CODE1-TARGETSEQUENCE- TARGETSEQUENCEPRIMER1-3′ CODE 2 3′-TARGETSEQUENCEPRIMER2- CODE2-5′

An example of a PCR strategy to incorporate three codes per well provided in TABLE 3.

TABLE 3 Primers Amplified PCR Products 5′-CODE1- CODE1-TARGETSEQUENCE- TARGETSEQUENCEPRIMER1-3′ CODE 2-ADAPTER-CODE3 3′-TARGETSEQUENCEPRIMER2- CODE2-ADAPTER 5′ 3′-ADAPTER′-CODE3′ 5′

Three oligo primers are used to make a single PCR product. Advantages to this system using two oligos to put a multi-partite barcode on one end of the molecule may include, for example, reducing maximum length of oligos needed or making extra-long barcodes.

This approach can be generalized to incorporate n barcodes per reaction. The approach can also have different implementations such that the barcodes are on the same side of the target sequence region. NGS sequencing adaptors may be added, and the full sequence for the population of barcoded PCR products may be read using next generation sequencing.

In another implementation, a fixed code may be added to indicate sample number or plate number and allow pooling of multiple samples/plates in a run for two barcodes as shown in TABLE 4.

TABLE 4 Primers Amplified PCR Products 5′-PLATEA-CODE1- PLATEA-CODE1- TARGETSEQUENCEPRIMER1-3′ TARGETSEQUENCE- 3′-TARGETSEQUENCEPRIMER2-CODE2-5′ CODE 2

In another implementation, a fixed code may be added to indicate sample number or plate number and allow pooling of multiple samples/plates in a run for three barcodes as shown in TABLE 5.

TABLE 5 Primers Amplified PCR Products 5′-PLATEA-CODE1- PLATEA-CODE1- TARGETSEQUENCEPRIMER1-3′ TARGETSEQUENCE- 3′-TARGETSEQUENCEPRIMER2-CODE2- CODE 2-ADAPTER- ADAPTER 5′ CODE3 3′-ADAPTER′-CODE3′ 5′

Note that in all cases the position of the barcode in the sequence conveys information hence the CODE1, CODE2, and CODE3 barcodes do not necessarily have to be different from each other in a particular well.

Making oligos and printing chips using a single code coding system are high cost. For example, a 10,000 well chip requires 10,000 single barcodes and 10,000 separate printing cycles to place those barcodes into the wells on the chip. If a two-code system is used, then potentially only 200 barcodes are required with only 200 printing cycles to manufacture chips. This represents a significant saving in oligo cost, printing time and printing capital investment.

The use of dual barcoded PCR primers, followed by amplification and sequencing analysis, to provide locational data on DNA or DNA containing moieties randomly partitioned onto a microfabricated chip may have high utility and relatively low cost.

FIG. 20 is a diagram illustrating an indexing system in accordance with some embodiments. Microwell chip 2000 has N rows and M columns, thereby producing N×M unique indices. A location of a microwell in chip 2000 may be considered to have the coordinates (N, M). Each column has a common reverse primer sequence (e.g., R1, R2, R3, . . . RM), and each row has a common forward primer sequence (e.g., F1, F2, F3, . . . FN). For example, a unique tag targeted to a specific genetic element in, for example, 16S ribosomal ribonucleic acid (rRNA) may include forward primer sequence F515 and reverse primer sequence R806. Following PCR of chip 2000, the presence of the targeted genetic element may be mapped back to a unique microwell of origin based on the presence of a forward primer sequence and a reverse primer sequence. For example, the presence of F515 and R806 directs a user to the microwell with coordinates (515, 806) in chip 2000.

Variability Reduction for PCR Amplification Product Across Microwells Containing Bacteria

A DNA-based locational indexing system may be used to determine what species is present in each well. This indexing system may involve having PCR primers preloaded into each well that contain addressing barcodes that identify the well, and a primer sequence targeted to a specific genetic element (e.g. 16S) in the microbial genome that provides species information. After incubation the microbial DNA may be released, the PCR primers amplify the target bacterial DNA region, and the amplicons from the various wells on a chip are pooled and then read by next generation sequencing.

Some embodiments for limiting the variability in the amount of PCR product across wells may include limiting amount of PCR primer in the well during manufacture of the chip such that for the majority of possible sample DNA concentrations the amount of PCR primer will limiting in the DNA amplification reaction, hence the amount of PCR product produced will be less variable across wells.

Some embodiments for limiting the variability in the amount of PCR product across wells may include limiting the number of PCR cycles on the chip to less than 3 cycles, or less than 5 cycles, or less than 10 cycles or less than 15 cycles, or less than 20 cycles or less than 25 cycles or less than 30 cycles such that the amount of PCR product produced will be less variable across wells vs. a full cycle PCR amplification protocol.

Some embodiments for limiting the variability in the amount of PCR product across wells may include limiting the amount of nucleotides in the reaction mix so that the number of PCR amplicons produced is a more related to the amount of nucleotides than the amount of DNA in the original sample. Microwells with a large amount of target DNA will exhaust the nucleotides early in the cycling process while microwells with a small amount of target DNA will exhaust the nucleotides later in the cycling process, but produce around the same amount of amplification product.

Some embodiments for limiting the variability in the amount of PCR product across wells may include limiting the amount of nutrient available to microbes growing in the wells such that cells will replicate until the media is exhausted then stop replicating.

Some embodiments for limiting the variability in the amount of PCR product across wells may include placing a dye in each well that identifies PCR product such that the signal gets brighter as more PCR product is produced. The intensity of the dye during each PCR cycle may be monitored, and a sample may be taken from the well once the desired signal intensity is observed.

Some embodiments for limiting the variability in the amount of PCR product across wells may include using mixtures of hybridization beads covered with oligos complementary to each well-specific bar code to selectively hybridize amplified DNA from each well. Once the beads are saturated unbound DNA may be washed away releasing bound DNA from the beads. The amount of DNA from each well will then be normalized at the saturation limit of the beads.

Some embodiments for limiting the variability in the amount of PCR product across wells may include incubating chips for a long period of time such that the fast growing microbes rapidly fill wells and cease replicating, and the slower growing microbes gradually fill wells and cease growing once approximately the same number of cells are in the wells

In some embodiments, use of barcoded primers and next generation sequencing (NGS) within the context of the chip format and method may be used to identify which species is growing in which well on the high density microchip. When an approximately equal number of bacteria occupy each microwell in the chip, the signal from each well in the NGS data may be approximately the same.

For example, in a typical NGS run generating 12 million sequence reads, if 24 chips are sequenced in the run, each having 10,000 microwells, and there is the same number of bacteria per well, there is on average 50 reads per well.

However, different bacteria grow at different rates so it is likely that some wells have few bacteria and some wells will have many bacteria. This potentially skews the NGS run so much that the wells with few bacteria are not detected in the NGS analysis.

Hence, in the example of a typical NGS run generating 12 million sequence reads, 24 chips are sequenced per run, each having 10,000 microwells, half of which have 100 times more bacteria in them than the other half. The probability that the bacteria in the slow growing wells are detected is markedly reduced. In this case: (10,000×24)/2×100=12,000,000  (1) (10,000×24)/2=120,000  (2)

The low frequency wells are represented at 1% of total. So of 12,000,000 reads in an NGS run 120,000 will be from the low frequency wells—i.e. average of 1 read per well.

To minimize the impact of this phenomenon novel methods need to be developed to help equalize the amount of PCR product across wells so that all wells are detected in the NGS run.

Silicon-Based Microwell Chips for Microbial Isolation, Growth, Screening, and Analysis

A microfabricated device or chip may be composed at least in part of silicon instead of or in addition to plastic, glass, and/or polymers to allow for electrical measurements on a well-by-well basis. For example, the walls of each well may be isolated to create microcapacitors. In another example, an FET in each well such that the gate surface is exposed to the contents of the well. Instead of a purely silicon-based chip, thin metal layers may be generated on top of an existing chip by plating, vapor deposition, and/or arc/flame spraying. This may add more functionality to a chip, utilize alternate methods of manufacture which may be cheaper and/or cleaner, and/or allow miniaturization for handheld and/or portable devices.

Some embodiments may allow for monitoring growth by electrical measurement.

Impedance monitoring may be applied to measure microorganism (e.g., bacterial) growth. For example, impedance across a tube containing Escherichia coli (E. coli) is compared to cell counts therefrom in Ur et al., “Impedance Monitoring of Bacterial Activity,” 8:1 J. Med. Microbiology 19-28 (1975), which is incorporated herein by reference in its entirety. Measurements may be taken on other types of bacteria including Pseudomonas, Klebsiella, and Streptococcus to demonstrate the effect is general. Wells may be filled with different media in order to test growth conditions across different formulations.

Some embodiments may allow for screening by electrical measurement. Electrical measurements may be made on a well-by-well basis allowing for screening. One example would be pH. There are a number of different ways to get a pH-dependent response from the gate of a device in a well including, but not limited to, ISFETs and pH-meters. An array of wells with embedded pH sensors may determine, electrically, which wells contain microbes that are producing acidic or basic metabolites. A simple example is screening for the production of lactic acid from lactose. Bacteria is diluted out into wells, grown, and then fed lactose. Wells that record a drop in pH contain microbes capable of metabolizing lactose into lactic acid.

Some embodiments may allow for electrical measurements of redox probes. Another way to leverage electrical measurements is to look at how bacteria in wells affect a known redox probe. Essentially, a system with well-defined response may be measured in the presence of bacteria and deviations from expected behavior may be attributed to the bacterial samples. A typical redox probe is something like ferricyanide; [Fe(CN)6]3-/4-. The reduction of ferricyanide to ferrocyanide is very well characterized such that small changes in behavior, particularly around electron transfer from the electrodes, are discoverable. This system is “label free” as it detects without having to directly modify the bacteria themselves.

Antibodies that can recognize microorganisms (e.g., E. coli) may be immobilized on ITO electrodes. Electron transfer resistance may be measured from the electrodes to a ferricyanide containing solution. E. coli binding to the electrode surface increases the resistance proportional to the concentration of E. coli on the surface. This is one example of a family of measurements that may be made to detect specific types of organisms or metabolites using redox probes.

Working in silicon (or at least metals or metallized plastics) provides advantages including, but not limited to, less expensive production of chips (e.g., by piggybacking on existing technologies); integrated detection capability allowing small and/or portable versions; additional measuring capabilities not present in other materials (e.g., LCR, CV, etc.); integration of newly discovered chip-based detection modalities into existing devices; and the combination of electrical measurements and sequencing. These advantages would benefit any customer using interferometric detection.

Releasable Barriers to Protect Well-Specific Chemistries on a Chip

FIGS. 21A-21E are diagrams illustrating a chip with well-specific chemistries in accordance with some embodiments. In FIG. 21A, a microfabricated device or chip is shown with a plurality of microwells. In FIG. 21B, microwell-specific chemistries have been disposed in each microwell of the chip. In FIG. 21C, a sealant has been applied over the microwell-specific chemistries in each microwell of the chip, thereby preventing interaction of the chemistries with further additions to the wells. In FIG. 21D, samples are loaded, and experiments are performed on the samples in the microwells. In FIG. 21E, a trigger (e.g., heat) releases the microwell-specific chemistries for interaction with samples in the wells.

Microwell chips may be manufactured, be cleaned, and/or have surfaces treated. The specific chemistries may be prepared separately and then deposited into wells by, for example, using a method and/or device that allows a specific set of chemicals to be directed to a specific well (or wells). A sealant then may be applied to protect the various chemistries from the environment and/or be removed/released/disbursed with some defined, external trigger.

A microfabricated device or chip may be manufactured to a specific design, for example, cleaned and/or surface treated to improve wetting. PCR primers may be printed or pin-spotted into specific wells. The chip may be allowed to dry, and then a wax layer may be deposited by evaporation from an ethanol solution. Optimal concentration may be about 1% v/v. Molten wax may be applied directly or an aqueous or alcohol wax solution may be sprayed. Alternatively, spin coating or vapor deposition may be used. Various waxes may be used including, but not limited to, glyceryl stearate with and without polyethylene glycol, cetearyl alcohol, 1-hexadecanol, glyceryl ester of stearic acid, ceteareth-20 (CAS Registry No. 68439-49-6), and some commercial products including, but not limited to, Lotionpro™ 165 (available from Lotioncrafter®, Eastsound, Wash.) and Polawax™ (available from Croda, Inc., Edison, N.J.). The underlying chemistry later may be released by, for example, heating until the wax melts. For these compositions it will be between 50° C. and 70° C. It is important to be low enough not to damage any chemical component or to boil our aqueous solutions.

The key concept is of well-specific chemistry that is walled off from the chip until the experimenter triggers release. This method may be used for barcoding in wells, but it also may be applied more broadly to a whole range of different problems. Different chemistries that may be useful to seal on a chip include, but are not limited to, antibiotics, fluors, dyes, PCR primers, lysis-promoters, antibodies, and/or tests for various metabolites. While wax is a good way to seal things that can later be released by heating, other materials may be used to seal and release upon exposure to light, sonication, and/or some other trigger. The advantage of this method over simply adding reagents to the chip is one of control on a well-by-well basis. A similar effect might be achieved by printing chemicals into wells after doing microbial experiments, but this introduces problems with time (the print run may be as long as a day) and the fact that it is impossible to expose every well for the same amount of time if each well is filled individually after the microbes are on the chip. With a release mechanism every well can be exposed at the same time. In one example, wax may be deposited onto chips by solvent casting.

Isolated Microwells for Simplicity and/or Controlling Relative Abundance

A high-density chip device may comprise a surface having high-density microwells. Microbes from a microbiome sample, or other cell types, may be diluted and applied to the device such that wells contain approximately one microbe or cell per occupied well. These microwells may be sealed with semi-permeable membranes that allow nutrients to diffuse into the microwells but prevent all or at least some of the microbes or cells from moving out of the microwells.

A sample of microbes or cells may be prepared and then sealed into a chip using an impermeable or only-gas-permeable membrane. No reservoir of liquid sits on top of the chip or membrane and hence only the nutrient in the well at the time of sealing is available to support growth of the microbes or cells in the microwell. Two reasons for this feature include: (1) simplicity in construction and workflow as the device need not have semi-permeable membranes or reservoirs, nutrients do not have to be added, and there is less potential for contamination; and (2) a check on the relative abundance of fast-growers by limiting their access to nutrients. For a sample containing some fast-growers and some slow-growers, the fast-growers will rapidly be resource-limited in their respective microwells and stop or slow growth while the slow-growers continue to grow. This provides for slow growers to be represented at a higher relative abundance in the population of microbes across the chip, compared to the case where the fast growers do not have a limiting amount of nutrient. This becomes important for downstream processing when sequencing everything on a chip. It also provides a better detection limit for rare species as the rare species are not outgrown by fast growing species to a point that limits the ability of the system to detect them.

Current methods attempt to get all species to grow whether they are fast- or slow-growing by nature. This has the inevitable result that fast-growers dominate communities and only increase in relative abundance with time. Many types of downstream analysis such as sequencing or fluorescence screening cannot resolve every species in a given population but only those above a certain limiting relative abundance. If the goal is to preserve diversity and detect rare species, then the fast-growers need to be limited in some way.

For an example that demonstrates this idea, consider the simple case of a sample containing two species: one doubles every day and the other doubles every week as shown in TABLE 6. If the slow-grower is rare to begin with, at 5% relative abundance, it soon becomes very rare as both species grow.

TABLE 6 Unlimited Day 0 Day 1 Day 2 Day 3 Day 7 Day 14 Fast grower 19 38 76 152 2432 311296 Slow grower 1 1 1 1 2 3 Total 20 39 77 153 2434 311299 Rel. ab. fast 0.950 0.974 0.987 0.993 0.999 1.000 Rel. ab. slow 0.050 0.026 0.013 0.007 0.001 0.000

If the fast-growers are limited by competition for nutrition and/or physical space to grow, then the relative abundance of the slow-growers will start to increase after some time has elapsed as shown in TABLE 7.

TABLE 7 Limited Day 0 Day 1 Day 2 Day 3 Day 7 Day 14 Fast grower 19 38 50 50 50 50 Slow grower 1 1 1 1 2 3 Total 20 39 51 51 52 53 Rel. ab. fast 0.950 0.974 0.980 0.980 0.962 0.943 Rel. ab. slow 0.050 0.026 0.020 0.020 0.038 0.057 High Density Microfabricated Arrays for Biobanking Cells

Biobanks are designed to give researchers access to a large number of samples from a large population in order to drive certain types of research, such as disease-related biomarker discovery. The current state of the art in biobanking provides for samples to be stored in tubes or low-density plate format such as a 96-well or 384-well plate. This works when the number of samples to be stored is relatively low in number and the samples themselves are discrete, isolated populations. Current approaches to biobanking become very cumbersome when storing samples, such as microbiome samples, where the number of samples may be high and the number of different species or variants in each sample may extend from hundreds to thousands or many millions per sample. Using current methods, a laborious isolation protocol must be implemented to separate out individual species or variants either prior to or subsequent to the storage step in order to access a desired species or variant.

The systems, kits, apparatus, and methodologies described herein may be applied to biobank cells, microbes, viruses, and other biological entities. A high-density chip device comprised of a surface having high density microwells may have thousands, hundreds of thousands, or millions of microwells per chip. For example, microbes from a microbiome sample (or another biological entity such as a different type of cell or a virus) may be diluted and applied to the device such that wells contain approximately one microbe per occupied well. The chip then may be incubated such that the microbe replicates within the well and the resulting population represents a single species. A nucleic acid-based locational indexing system may be utilized to determine what species is present in each well. This indexing system may involve having PCR primers preloaded into each well. The PCR primers may contain addressing barcodes that identify the well, and a primer sequence targeted to a specific genetic element (e.g., 16S) in the microbial genome that provides species information or targets a desired genetic sequence. After incubation the microbial DNA is released, and the PCR primers amplify the target bacterial DNA region. The amplicons from the various wells on a chip may be pooled and then read by next generation sequencing.

Using high-density microfabricated chips for biobanking provides for a multitude of species or variants within each sample to be stored as separate populations without the need to implement a laborious isolation protocol either before or after storage. Using the DNA-based locational indexing system or a custom assay enables a simpler, generic approach to identifying genetic signatures or characteristics of the contents of each microwell to give information such as, for example, species information. Additionally, the chip devices provide for an extremely space effective method of storing cell isolates. For example, a single microscope slide dimensioned chip with 100,000 wells occupies substantially less space that the corresponding traditional storage formats. The chip format also may be useful for properly archiving and curating samples and/or for managing subject (e.g., patient) information databases by having one chip contain many different samples from a single subject.

In order to bank cells using this apparatus, cells may be disposed and/or positioned in microwells of the apparatus. The cells in the microwells may be treated to ameliorate the impact of storage then placed in appropriate storage conditions. For example, cells may be treated with agents such as glycerol to ameliorate the impact of freezing. Then the chip may be placed in appropriate storage conditions such as a freezer. The cells may be dehydrated, lyophilized, and/or freeze dried, and the chip may be placed in appropriate conditions to safeguard the dried cells. Additional structures may be added to the chip to further enhance its utility as a storage device. For example, a membrane or another structural element may be placed on top of the chip to seal at least some of the wells prior to storage.

A chip may be loaded with cells such that a portion of microwells on the chip are occupied by approximately one cell each. The chip is incubated to allow for replication of cells. The chip is duplicated, and either the original chip or the duplicate chip is used to identify the cells or species or gene signatures present in each well of the chip (by, e.g., using the locational indexing system described above). The chip is treated and/or stored in appropriate conditions. The replication step and/or the identification step may take place after storage rather than before storage.

One or more cells from each strain of a pre-existing set of isolated strains may be disposed into separate microwells on a chip. The position of the microwell into which each strain or cell type was placed may be recorded, and the chip may be treated and/or stored in appropriate conditions.

A version of the chip may be created in which preservative chemistry is sequestered underneath a wax barrier in each well. Isolates may be allowed to grow sealed up inside a chip and then preserved at a later date by heat-induced release of the preservatives before banking.

Such apparatus may be used to store/biobank mixed microbiome samples such as microbiome samples from soil, human gut, seawater, oral cavity, skin, etc. A chip may be used to store other types of biological entities such as fungi, archaebacteria, human cells (including reproductive cells), animal cells, and viruses.

The DNA locational indexing system may be used across all biological entity types to generate information regarding the content of each well. An entire chip may be screened for desired activity using custom assays such as antibody- or substrate-based assays. For example, a chip with banked populations of T cells may be screened for a particular immunological activity.

In one illustrative example, human stool microbiome samples may be collected from study participants. The stool microbes from each individual may be biobanked on chips to maintain both a record of that individual's microbiome as well as a sample of the microbiome to use as a source of target microbes at a later date. In another example, mixed populations of T cells or other immunological cells may be sampled from individuals during clinical or research studies or as part of a therapeutic workflow (e.g., cell therapy using ex vivo treated cells). In yet another example, soil biomes may be stored in conjunction with seed banking.

High Resolution Picking

A high accuracy/precision picking apparatus or system may be designed to execute various picking functions from and/or to microwells on a microfabricated chip described above. A target substrate or chip may be a microscope slide format (approximately 25 mm×75 mm×1 mm) with injection-molded features on one surface. Microwells may be arranged in a grid pattern with about 4-8 mm well-free edge around the edges of the chip. Well size and spacing may be determined based on picker capability. Microwells may be square with a size from about 25 μm to about 200 μm along each edge and spacing in from about 25 μm to about 100 μm between well edges. Microwells may be circular or hexagonal instead. Well depths may be from about 25 μm to about 100 μm. For example, a 75 mm×25 mm slide with a 7 mm edge, 100 μm square wells with 100 micron edge-to-edge spacing will have about 16,775 microwells.

A high accuracy/precision picking system may be designed to execute various picking functions from and/or to portions of a membrane corresponding to microwells on a microfabricated chip, as described above. A membrane may be a thin sheet that has previously been used to seal growing bacteria into microwells. When peeled off the chip the membrane may retain an imprint of the microwell array as well as a sample of bacteria on its surface after separation from the chip. Thus, the peeled membrane may act as a replicate of the bacteria growing in the chip.

A high resolution picker may receive data input from a user. The input may include at least one pair of chip microwell coordinates such that the picker picks from and/or to the at least one input pair of coordinates. A sterilization routine may be performed between cycles. A high resolution picker may be capable of operating in an anaerobic chamber.

A high resolution picker system may receive a chip and align the picker with the chip, for example, using fiducial markers and/or reference wells. The picker may pick, for example, cells growing in microwells on the chip into, for example, 96- or 384-well plates containing growth media. The picker may include a single picking pin or a plurality of picking pins.

A high resolution picker system may receive a membrane and align the picker with the membrane, for example, using reference well marks on the membrane. The picker may pick, for example, cells from the membrane into, for example, 96- or 384-well plates containing growth media. The picking pin(s) may have a different shape (e.g., mushroom-shaped) and/or surface (e.g., texture) for picking from a membrane. The system also may include one or more mechanisms (e.g., a floating pin and/or vacuum) to hold and/or flatten the membrane.

A high resolution picker system may enable chip replication via a chip-to-chip transfer. The picker may receive and align a first chip based on fiducial markers and/or reference wells. The picker also may receive and align a second chip based on fiducial markers and/or reference wells. The picker may transfer, for example, cells growing in microwells on the first chip to microwells on the second chip.

A high throughput system for automatically picking a target species of a plurality of species of at least one biological entity cultivated in a microfabricated device may include a port for receiving the microfabricated device. The microfabricated device defines a high density array of microwells. Each microwell of the high density array of microwells is configured to isolate and cultivate at least one species of the at least one biological entity and includes at least one tag of a plurality of unique tags. Each tag of the plurality of unique tags includes a nucleic acid molecule, which includes a target-specific nucleotide sequence for annealing to the at least one biological entity and a location-specific nucleotide sequence correlating to at least one microwell of the high density array of microwells. The system also includes a high-resolution picking apparatus with at least one protrusion for picking the at least one biological entity from at least one microwell of the high density array of microwells. The system further includes an input device for receiving an indication of at least one target-specific nucleotide sequence and at least one processor communicatively coupled to the input device and the high-resolution picking apparatus. The at least one processor acquires the indication of the at least one target-specific nucleotide sequence from the input device, compares the at least one target-specific nucleotide sequence to the plurality of unique tags, determines at least one microwell of the high density array of microwells including the target species based on the comparison, and controls the high-resolution picking apparatus to pick the at least one biological entity from the at least one determined microwell of the high density array of microwells.

A high throughput system is disclosed for automatically picking a target species of a plurality of species of at least one biological entity cultivated in a microfabricated device. The microfabricated device defines a high density array of microwells, each microwell of the high density array of microwells being associated with at least one unique primer of the plurality of unique primers. The system includes a port for receiving a membrane removed from the microfabricated device, the membrane having sealed each microwell of the high density array of microwells to retain the at least one biological entity in the high density array of microwells, such that portions of the at least one biological entity corresponding to the high density array of microwells remain attached to the membrane following removal of the membrane. The system also includes a high-resolution picking apparatus including at least one protrusion for picking the at least one biological entity from at least one membrane location corresponding to at least one microwell of the high density array of microwells, an input device for receiving an indication of at least one target-specific nucleotide sequence associated with the target species, and at least one processor communicatively coupled to the input device and the high-resolution picking apparatus. The at least one processor acquires the indication of the at least one target-specific nucleotide sequence from the input device, compares the at least one target-specific nucleotide sequence to the plurality of unique tags, determines at least one membrane location corresponding to at least one microwell of the high density array of microwells comprising the target species based on the comparison, and controls the high-resolution picking apparatus to pick the portions of the at least one biological entity from the at least one determined membrane location.

The above-described embodiments can be implemented in any of numerous ways. For example, embodiments may be implemented using hardware, software or a combination thereof. When implemented in software, the software code can be executed on any suitable processor or collection of processors, whether provided in a single computer or distributed among multiple computers.

Further, it should be appreciated that a computer may be embodied in any of a number of forms, such as a rack-mounted computer, a desktop computer, a laptop computer, or a tablet computer. Additionally, a computer may be embedded in a device not generally regarded as a computer but with suitable processing capabilities, including a Personal Digital Assistant (PDA), a smart phone or any other suitable portable or fixed electronic device.

Also, a computer may have one or more input and output devices. These devices can be used, among other things, to present a user interface. Examples of output devices that can be used to provide a user interface include printers or display screens for visual presentation of output and speakers or other sound generating devices for audible presentation of output. Examples of input devices that can be used for a user interface include keyboards, and pointing devices, such as mice, touch pads, and digitizing tablets. As another example, a computer may receive input information through speech recognition or in other audible format.

Such computers may be interconnected by one or more networks in any suitable form, including a local area network or a wide area network, such as an enterprise network, and intelligent network (IN) or the Internet. Such networks may be based on any suitable technology and may operate according to any suitable protocol and may include wireless networks, wired networks or fiber optic networks.

The various methods or processes outlined herein may be coded as software that is executable on one or more processors that employ any one of a variety of operating systems or platforms. Additionally, such software may be written using any of a number of suitable programming languages and/or programming or scripting tools, and also may be compiled as executable machine language code or intermediate code that is executed on a framework or virtual machine.

Lateral Flow

In some embodiments, the systems, kits, apparatus, and methods described above can be used to provide a lateral flow of a liquid across the microwells on a microfabricated device, therefore provide a way to change contents (e.g., nutrient, media, etc.) or perform assays in the microwells without having to expose the contents of the microwells to air. Compared to traditional methods of changing fluids using peristaltic pumps, microfluidic channels or by pipetting, this approach can also reduce and/or prevent dead volumes, bubbles, and other problems associated with moving liquids in small and enclosed spaces such as microwells.

Accordingly, in one aspect, the present disclosure provides a method to operate or manipulate a microfabricated device. A microfabricated device having a plurality of microwells is provided, and a membrane is applied on the microfabricated device and covers at least one microwell of the plurality of the microwells. The membrane has a first portion disposed on one side of the at least one microwell and a second portion disposed on the other side of the at least one microwell. The first portion of the membrane is contacted with a first liquid which is absorbable by the membrane such that the first liquid is wicked or drawn by the membrane and laterally flows from the first portion to the second portion across the at least one microwell. While the bulk of the first liquid is moving along the membrane, at least a portion of the first liquid also enters into the at least one microwell (and mix with the existing content in the microwell). In some embodiments, some of the content of the at least one microwell, e.g., a liquid previously existing in the microwell, or other components or substances dissolvable in the first liquid, can be carried by the first liquid from the at least one microwell and transported downstream with the first liquid through the membrane.

As illustrated in FIG. 22A, a plurality of microwells 2212 of a microfabricated device 2210 having is covered by a membrane 2220 (e.g., a 0.01 micron thick PCTE membrane). A first portion 2221 of the membrane 2220 is on one side of the microwells 2212, and a second portion 2222 of the membrane 2220 is on the other side of the microwells 2212. The first membrane portion 2221 is contacted with a liquid 2230 (which can be contained in a liquid reservoir) and draws the liquid to move through the membrane and across the microwells 2212 to the second membrane portion 2222. The second membrane portion 2222 is exposed to air where the liquid can evaporate, providing the capillary action to drive the lateral flow of the liquid 2230 from the first membrane portion 2221 to the second membrane portion 2222. A liquid impermeable barrier (e.g., a thin plastic film or sheet) 2240 is laid on top of and covers the third portion 2223 of the membrane 2220 (the third portion 2223 is between the first portion 2221 and the second portion 2223) to constrain the direction of the lateral flow. FIG. 22B is a top view image of this setup for the observation of the microwells.

The first liquid that is wicked across the microfabricated device can include a reagent, which enters into the at least one microwell with the liquid. The at least one microwell can comprise a substance that is reactive to the at least one reagent in the first liquid. The reaction between the substance and the reagent in the first liquid can produce a visually observable result. In some embodiments, the microwells encountered on the path of the lateral flow of the liquid can contain different contents, and the reagent included in the first liquid can selectively react with the contents in some but not other microwells.

For example, in some embodiments, colorimetric assays may be performed where a reagent in the first liquid can react with a substance in the microwells, such as a metabolite or byproduct of cells in the microwells or an entity on the surface of a cell in the microwell, to result in an observable visual change in the microwells. Other types of assays can also be performed where a reagent in the first liquid may react with a substance in the microwells to produce other signals detectable by an instrument. In an example, a pH indicator can be included in the first liquid, and the flow of first liquid across the microwells can show a color change in those microwells where the pH reaches a certain range after the reagent is flowed into the microwells. For example, the presence of microbes that metabolize lactose into lactic acid in microwells would cause a drop in pH in those microwells relative to microwells without those microbes. Similarly, the presence of microbes that metabolize ammonium ion or organic acids in microwells would cause a rise in pH in those microwells relative to microwells without those microbes.

In some embodiments, the absorptive membrane being used as the wick can be made from hydrophilic material, e.g., cellulose, nitrocellulose, and polyvinylpyrrolidone (PVP) doped polycarbonate track etch (PCTE) membranes. The ability of a liquid to maintain contact with a membrane (i.e., the wetting properties of the membrane) depend, at least in part, on the composition and structure of the membrane. For example, hydrophilic materials (e.g., nitrocellulose and polyvinylpyrrolidone (PVP) doped polycarbonate track etch (PCTE) membranes) have good wetting properties. Furthermore, the internal structure of the membrane can affect the lateral flow of the liquid. For example, the size of the pores or channels and the ways the pores/channels are connected can also affect the speed at which the first liquid moves through the membrane. The volatility of the carrier solvent in the first liquid as well as the atmosphere (e.g., degree of vacuum) above the exposed second membrane portion is exposed can also affect the amount of the capillary action. The pore or channel sizes of the membrane can be selected such that only substances of certain sizes or smaller can be carried or transported by the lateral flow of the liquid in the membrane, and biological entities that may be contained in the microwells, such as cells or microorganisms, will remain in the microwells and not transported across the membrane (while different assay reagents or media from the first fluid, or certain small molecules in the microwells are wicked across the membrane). In chemical testing applications, chemical entities such as proteins, oligonucleotides, sugars, hydrocarbons, catalysts, or other molecules of interest may be tethered within the microwells via a direct attachment to an interior surface of a well or a structure (e.g., a bead) kept within the microwells. The tethering can be accomplished by chemical bonding or physical interaction (e.g., non-covalent high-affinity binding).

As illustrated in FIGS. 23A-23C, a liquid containing a red dye is laterally flowed across the top of a microfabricated device in accordance with some embodiments. FIG. 23A is a top view image of a microfabricated chip with an ongoing lateral flow. In FIG. 23B, the red dye is being wicked across the membrane and filling the microwells. In FIG. 23C, all of the microwells have been filled with the red dye. Besides a dye, the liquid may comprise any chemical entity that may generate information on the contents of the microwells.

The lateral flow of the liquid can also be used to draw out a substance that is previously present in the at least one microwell (either originally existing in the microwells or introduced by a previous round of lateral flow). As an illustration for this concept, FIGS. 24A-24C are images showing removal of the red dye and the introduction of a blue liquid dye. In FIG. 24A, a band of blue dye is shown flowing across the membrane and filling the microwells in the lower left corner. In FIG. 24B, the blue dye has filled half the microwells on the chip, and in FIG. 24C, almost all of the microwells have been filled with the blue dye. FIG. 24D is a top view image of the microfabricated device showing the band of red dye followed by the band of blue. The dyes show as separate bands on the microfabricated device. In FIG. 24E, the microfabricated device is shown after the blue dye has been flushed and replaced with water in a few minutes.

In a like manner, sequential assays may be performed on the same microwells to test for different activities. For example, a two-assay embodiment may be accomplished by wicking a first reagent for assay #1 across the chip, observing the results, and then wicking a second reagent for assay #2 across the chip. For example, a first reagent can be a pH indicator which is flowed across the microwells and changes observed. Water or pure media is then wicked through the membrane to flush the microwells. The next reagent, e.g., an indicator sensitive to alcohol production, can then be introduced with a second liquid to flow across the microwells. In this way, the microwells may be assayed for multiple parameters. One or more wash steps, regeneration steps, or other procedures may be performed between the two assays.

In some embodiments, the liquid used in the lateral flow method can include a media, and the lateral flow approach can be used to select one or more species of microbes or types of cells that grow faster with a certain media. For example, a mixture of microbes may be loaded on a plurality of microwells such that each occupied microwell holds approximately one cell. The microwells can be sealed and incubated with a test media wicked across the microfabricated device such that the microwells with microbes that grow at higher rates in the presence of the test media may be identified. This step may be repeated to wick another media into the microwells, while retaining the microbes within the microwells or additional test media may be wicked across the plurality of microwells.

In some embodiments, certain components of a medium contained in the microwells can be flushed out with the lateral flow method, for example, by a solution containing primers, polymerase, dNTPs, etc., so that the on-chip PCR can be performed in the microwells.

In some embodiments, cells that express certain antigens may be selected by the lateral flow method. For example, a mixture of microbes may be loaded on a plurality of microwells such that each occupied well holds approximately one cell. The microwells may be sealed and incubated with a media wicked across the chip. Next, an assay reagent comprising a fluorescent dye (or label) conjugated to an antibody specific to a target antigen may be wicked across the microfabricated device. Then, a wash solution may be wicked across the microfabricated device such that microwells with microbes that bind the fluorescent probe may be observed.

Conclusion

While various inventive embodiments have been described and illustrated herein, those of ordinary skill in the art will readily envision a variety of other means and/or structures for performing the function and/or obtaining the results and/or one or more of the advantages described herein, and each of such variations and/or modifications is deemed to be within the scope of the inventive embodiments described herein. More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the inventive teachings is/are used. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific inventive embodiments described herein. It is, therefore, to be understood that the foregoing embodiments are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, inventive embodiments may be practiced otherwise than as specifically described and claimed. Inventive embodiments of the present disclosure are directed to each individual feature, system, article, material, kit, and/or method described herein. In addition, any combination of two or more such features, systems, articles, materials, kits, and/or methods, if such features, systems, articles, materials, kits, and/or methods are not mutually inconsistent, is included within the inventive scope of the present disclosure.

Also, various inventive concepts may be embodied as one or more methods, of which an example has been provided. The acts performed as part of the method may be ordered in any suitable way. Accordingly, embodiments may be constructed in which acts are performed in an order different than illustrated, which may include performing some acts simultaneously, even though shown as sequential acts in illustrative embodiments.

All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety.

All definitions, as defined and used herein, should be understood to control over dictionary definitions, definitions in documents incorporated by reference, and/or ordinary meanings of the defined terms.

The indefinite articles “a” and “an,” as used herein in the specification and in the claims, unless clearly indicated to the contrary, should be understood to mean “at least one.”

The phrase “and/or,” as used herein in the specification and in the claims, should be understood to mean “either or both” of the elements so conjoined, i.e., elements that are conjunctively present in some cases and disjunctively present in other cases. Multiple elements listed with “and/or” should be construed in the same fashion, i.e., “one or more” of the elements so conjoined. Other elements may optionally be present other than the elements specifically identified by the “and/or” clause, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, a reference to “A and/or B”, when used in conjunction with open-ended language such as “comprising” can refer, in one embodiment, to A only (optionally including elements other than B); in another embodiment, to B only (optionally including elements other than A); in yet another embodiment, to both A and B (optionally including other elements); etc.

As used herein in the specification and in the claims, “or” should be understood to have the same meaning as “and/or” as defined above. For example, when separating items in a list, “or” or “and/or” shall be interpreted as being inclusive, i.e., the inclusion of at least one, but also including more than one, of a number or list of elements, and, optionally, additional unlisted items. Only terms clearly indicated to the contrary, such as “only one of” or “exactly one of,” or, when used in the claims, “consisting of,” will refer to the inclusion of exactly one element of a number or list of elements. In general, the term “or” as used herein shall only be interpreted as indicating exclusive alternatives (i.e. “one or the other but not both”) when preceded by terms of exclusivity, such as “either,” “one of,” “only one of,” or “exactly one of.” “Consisting essentially of,” when used in the claims, shall have its ordinary meaning as used in the field of patent law.

As used herein in the specification and in the claims, the phrase “at least one,” in reference to a list of one or more elements, should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements. This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase “at least one” refers, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, “at least one of A and B” (or, equivalently, “at least one of A or B,” or, equivalently “at least one of A and/or B”) can refer, in one embodiment, to at least one, optionally including more than one, A, with no B present (and optionally including elements other than B); in another embodiment, to at least one, optionally including more than one, B, with no A present (and optionally including elements other than A); in yet another embodiment, to at least one, optionally including more than one, A, and at least one, optionally including more than one, B (and optionally including other elements); etc.

In the claims, as well as in the specification above, all transitional phrases such as “comprising,” “including,” “carrying,” “having,” “containing,” “involving,” “holding,” “composed of,” and the like are to be understood to be open-ended, i.e., to mean including but not limited to. Only the transitional phrases “consisting of” and “consisting essentially of” shall be closed or semi-closed transitional phrases, respectively, as set forth in the United States Patent Office Manual of Patent Examining Procedures, Section 2111.03. 

What is claimed is:
 1. A method comprising: providing a microfabricated device having a plurality of microwells, and a membrane applied on the microfabricated device and covering at least one microwell of the plurality of the microwells, the membrane having a first portion disposed on one side of the at least one microwell and a second portion on the other side of the at least one microwell; and contacting the first portion of the membrane with a first liquid absorbable by the membrane such that the first liquid is wicked by the membrane and laterally flows from the first portion to the second portion and across the at least one microwell, and at least a portion of the first liquid enters into the at least one microwell.
 2. The method of claim 1, wherein the first liquid comprises at least one reagent, and the at least one reagent enters into the at least one microwell.
 3. The method of claim 2, wherein the at least one microwell comprises a substance reactive to the at least one reagent in the first liquid.
 4. The method of claim 3, wherein the substance reactive to the at least one reagent reacts with the at least one reagent to produce a visually observable change.
 5. The method of claim 1, wherein the at least one microwell comprises at least one substance, and when the first liquid laterally flows across the at least one microwell, at least a portion of the at least one substance is drawn out of the at least one microwell.
 6. The method of claim 1, wherein the second portion of the membrane is exposed to air.
 7. The method of claim 1, wherein the membrane comprises a third portion disposed between the first portion and the second portion, the third portion being covered by a liquid impermeable barrier.
 8. The method of claim 1, further comprising: contacting the first portion of the membrane with a second liquid such that the second liquid is wicked by the membrane and laterally flows from the first portion to the second portion across the at least one microwell.
 9. The method of claim 8, further comprising: before contacting the first portion of the membrane with the second liquid, contacting the first portion of the membrane with a third liquid to flush out a portion of the first liquid remaining in the at least one microwell.
 10. The method of claim 1, wherein the at least one microwell comprises at least one biological entity that does not migrate out of the at least one microwell.
 11. The method of claim 1, wherein the at least one microwell comprise a chemical entity tethered in the microwell such that the chemical entity does not migrate out of the at least one microwell.
 12. The method of claim 1, wherein the first liquid comprises a media.
 13. The method of claim 1, wherein the first liquid comprises an antibody.
 14. The method of claim 13, wherein the antibody is conjugated to a fluorescent label.
 15. The method of claim 1, wherein the first liquid comprises a fluorescent or colorimetric reagent.
 16. The method of claim 1, wherein the plurality of microwells has a surface density of at least 150 microwells per cm², at least 250 microwells per cm², at least 400 microwells per cm², at least 500 microwells per cm², at least 750 microwells per cm², at least 1,000 microwells per cm², at least 2,500 microwells per cm², at least 5,000 microwells per cm², at least 7,500 microwells per cm², at least 10,000 microwells per cm², at least 50,000 microwells per cm², at least 100,000 microwells per cm², or at least 160,000 per cm².
 17. The method of claim 1, wherein each microwell of the plurality of microwells of the microfabricated device has a diameter of from about 5 μm to about 500 μm, from about 10 μm to about 300 μm, or from about 20 μm to about 200 μm.
 18. A method comprising: providing a microfabricated device having a plurality of microwells; loading a sample into at least one microwell of the plurality of microwells; applying a membrane on the microfabricated device to cover the at least one microwell, a first portion of the membrane being disposed on one side of the at least one microwell and a second portion of the membrane being disposed on the other side of the at least one microwell; and contacting the first portion of the membrane with a first liquid absorbable by the membrane such that the first liquid is wicked by the membrane and laterally flows from the first portion to the second portion and across the at least one microwell, and at least a portion of the first liquid enters into the at least one microwell.
 19. The method of claim 18, wherein the plurality of microwells has a surface density of at least 150 microwells per cm², at least 250 microwells per cm², at least 400 microwells per cm², at least 500 microwells per cm², at least 750 microwells per cm², at least 1,000 microwells per cm², at least 2,500 microwells per cm², at least 5,000 microwells per cm², at least 7,500 microwells per cm², at least 10,000 microwells per cm², at least 50,000 microwells per cm², at least 100,000 microwells per cm², or at least 160,000 per cm².
 20. The method of claim 18, wherein each microwell of the plurality of microwells of the microfabricated device has a diameter of from about 5 μm to about 500 μm, from about 10 μm to about 300 μm, or from about 20 μm to about 200 μm. 